| dioon | (noun) any cycad of the genus Dioon; handsome palmlike cycads with robust crowns of leaves and rugged trunks | - |
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| diopter | (noun) a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists | Synonyms: dioptre |
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| dioptre | (noun) a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters; used by oculists | Synonyms: diopter |
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| diorama | (noun) a picture (or series of pictures) representing a continuous scene | Synonyms: cyclorama, panorama |
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| diorite | (noun) a granular crystalline intrusive rock | - |
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| dioxide | (noun) an oxide containing two atoms of oxygen in the molecule | - |
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| dioxin | (noun) any of several toxic or carcinogenic hydrocarbons that occur as impurities in herbicides | - |
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| dip | (noun) a brief swim in water | Synonyms: plunge |
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| (noun) a gymnastic exercise on the parallel bars in which the body is lowered and raised by bending and straightening the arms | - |
| (noun) a candle that is made by repeated dipping in a pool of wax or tallow | - |
| (noun) a sudden sharp decrease in some quantity | Synonyms: drop, fall, free fall |
| (noun) a brief immersion | - |
| (noun) tasty mixture or liquid into which bite-sized foods are dipped | - |
| (noun) a thief who steals from the pockets or purses of others in public places | Synonyms: cutpurse, pickpocket |
| (noun) (physics) the angle that a magnetic needle makes with the plane of the horizon | Synonyms: angle of dip, inclination, magnetic dip, magnetic inclination |
| (noun) a depression in an otherwise level surface | - |
| (verb) stain an object by immersing it in a liquid | - |
| (verb) go down momentarily | - |
| (verb) dip into a liquid while eating | Synonyms: dunk |
| (verb) immerse briefly into a liquid so as to wet, coat, or saturate | Synonyms: douse, dunk, plunge, souse |
| (verb) plunge (one's hand or a receptacle) into a container | - |
| (verb) immerse in a disinfectant solution | - |
| (verb) scoop up by plunging one's hand or a ladle below the surface | - |
| (verb) place (candle wicks) into hot, liquid wax | - |
| (verb) dip into a liquid | Synonyms: douse, duck |
| (verb) appear to move downward | Synonyms: sink |
| (verb) slope downwards | - |
| (verb) lower briefly | - |
| (verb) switch (a car's headlights) from a higher to a lower beam | Synonyms: dim |
| (verb) take a small amount from | - |
| diphenhydramine | (noun) antihistamine (trade name Benadryl) used to treat allergic reactions involving the nasal passages (hay fever) and also to treat motion sickness | Synonyms: Benadryl |
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| diphenylhydantoin | (noun) an anticonvulsant drug (trade name Dilantin) used to treat epilepsy and that is not a sedative | Synonyms: Dilantin, phenytoin |
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| diphtheria | (noun) acute contagious infection caused by the bacterium Corynebacterium diphtheriae; marked by the formation of a false membrane in the throat and other air passages causing difficulty in breathing | - |
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| diphthong | (noun) a vowel sound that starts near the articulatory position for one vowel and moves toward the position for another | - |
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| diphthongise | (verb) change from a simple vowel to a diphthong | Synonyms: diphthongize |
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| diphthongize | (verb) change from a simple vowel to a diphthong | Synonyms: diphthongise |
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| diplegia | (noun) paralysis of corresponding parts on both sides of the body | - |
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| diplococcus | (noun) Gram-positive bacteria usually occurring in pairs | - |
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| diplodocus | (noun) a huge quadrupedal herbivore with long neck and tail; of late Jurassic in western North America | - |
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| diploid | (adjective) of a cell or organism having two sets of chromosomes or twice the haploid number | - |
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| (noun) (genetics) an organism or cell having the normal amount of DNA per cell; i.e., two sets of chromosomes or twice the haploid number | - |
| diploidy | (noun) the condition of being diploid | - |
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| diploma | (noun) a document certifying the successful completion of a course of study | Synonyms: sheepskin |
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| diplomacy | (noun) subtly skillful handling of a situation | Synonyms: delicacy, discreetness, finesse |
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| (noun) wisdom in the management of public affairs | Synonyms: statecraft, statesmanship |
| (noun) negotiation between nations | Synonyms: diplomatic negotiations |
| diplomat | (noun) an official engaged in international negotiations | Synonyms: diplomatist |
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| (noun) a person who deals tactfully with others | - |
| diplomate | (noun) medical specialist whose competence has been certified by a diploma granted by an appropriate professional group | - |
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| diplomatic | (adjective) using or marked by tact in dealing with sensitive matters or people | Synonyms: diplomatical |
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| (adjective) relating to or characteristic of diplomacy | - |
| diplomatical | (adjective) using or marked by tact in dealing with sensitive matters or people | Synonyms: diplomatic |
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| diplomatically | (adverb) with diplomacy; in a diplomatic manner | - |
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| diplomatist | (noun) an official engaged in international negotiations | Synonyms: diplomat |
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| diplopia | (noun) visual impairment in which an object is seen as two objects | Synonyms: double vision |
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| diplotene | (noun) the fourth stage of the prophase of meiosis | - |
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| dipolar | (adjective) having equal and opposite electric charges or magnetic poles having opposite signs and separated by a small distance | - |
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| dipole | (noun) an aerial half a wavelength long consisting of two rods connected to a transmission line at the center | Synonyms: dipole antenna |
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| (noun) a pair of equal and opposite electric charges or magnetic poles separated by a small distance | - |
| dipped | (adjective) having abnormal sagging of the spine (especially in horses) | Synonyms: lordotic, swayback, swaybacked |
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| dipper | (noun) small North American diving duck; males have bushy head plumage | Synonyms: Bucephela albeola, bufflehead, butterball |
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| (noun) small stocky diving bird without webbed feet; frequents fast-flowing streams and feeds along the bottom | Synonyms: water ouzel |
| (noun) a ladle that has a cup with a long handle | - |
| dipsomania | (noun) an intense persistent desire to drink alcoholic beverages to excess | Synonyms: alcoholism, potomania |
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| dipsomaniac | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, alky, boozer, lush, soaker, souse |
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| dipstick | (noun) a graduated rod dipped into a container to indicate the fluid level | - |
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| dipteran | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteron, dipterous insect, two-winged insects |
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| dipterocarp | (noun) tree of the family Dipterocarpaceae | - |
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| dipteron | (noun) insects having usually a single pair of functional wings (anterior pair) with the posterior pair reduced to small knobbed structures and mouth parts adapted for sucking or lapping or piercing | Synonyms: dipteran, dipterous insect, two-winged insects |
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| dipterous | (adjective) of or relating to or belonging to the Diptera | - |
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| diptych | (noun) a painting or carving (especially an altarpiece) on two panels (usually hinged like a book) | - |
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| dire | (adjective) fraught with extreme danger; nearly hopeless | Synonyms: desperate |
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| (adjective) causing fear or dread or terror | Synonyms: awful, direful, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
| direct | (adjective) direct in spatial dimensions; proceeding without deviation or interruption; straight and short | - |
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| (adjective) (of a current) flowing in one direction only | - |
| (adjective) straightforward in means or manner or behavior or language or action | - |
| (adjective) similar in nature or effect or relation to another quantity | - |
| (adjective) in a straight unbroken line of descent from parent to child | Synonyms: lineal |
| (adjective) moving from west to east on the celestial sphere; or--for planets--around the sun in the same direction as the Earth | - |
| (adjective) lacking compromising or mitigating elements | Synonyms: exact |
| (adjective) in precisely the same words used by a writer or speaker | Synonyms: verbatim |
| (adjective) having no intervening persons, agents, conditions | Synonyms: unmediated |
| (adjective) being an immediate result or consequence | - |
| (adverb) without deviation | Synonyms: directly, straight |
| (verb) plan and direct (a complex undertaking) | Synonyms: engineer, mastermind, orchestrate, organise, organize |
| (verb) specifically design a product, event, or activity for a certain public | Synonyms: aim, calculate |
| (verb) command with authority | - |
| (verb) give directions to; point somebody into a certain direction | - |
| (verb) put an address on (an envelope) | Synonyms: address |
| (verb) point or cause to go (blows, weapons, or objects such as photographic equipment) towards | Synonyms: aim, take, take aim, train |
| (verb) intend (something) to move towards a certain goal | Synonyms: aim, place, point, target |
| (verb) guide the actors in (plays and films) | - |
| (verb) lead, as in the performance of a composition | Synonyms: conduct, lead |
| (verb) take somebody somewhere | Synonyms: conduct, guide, lead, take |
| (verb) cause to go somewhere | Synonyms: send |
| (verb) direct the course; determine the direction of travelling | Synonyms: channelise, channelize, guide, head, maneuver, manoeuver, manoeuvre, point, steer |
| (verb) govern or manage | - |
| directed | (adjective) manageable by a supervising agent | - |
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| (adjective) (often used in combination) having a specified direction | - |
| directing | (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directional, directive, guiding |
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| direction | (noun) the act of managing something | Synonyms: management |
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| (noun) the act of setting and holding a course | Synonyms: guidance, steering |
| (noun) a general course along which something has a tendency to develop | - |
| (noun) the concentration of attention or energy on something | Synonyms: centering, centring, focal point, focus, focusing, focussing |
| (noun) something that provides direction or advice as to a decision or course of action | Synonyms: counsel, counseling, counselling, guidance |
| (noun) a formal statement of a command or injunction to do something | Synonyms: charge, commission |
| (noun) a message describing how something is to be done | Synonyms: instruction |
| (noun) a line leading to a place or point | Synonyms: way |
| (noun) the spatial relation between something and the course along which it points or moves | - |
| directional | (adjective) relating to or indicating directions in space | - |
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| (adjective) relating to direction toward a (nonspatial) goal | - |
| (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directing, directive, guiding |
| directionality | (noun) the property of a microphone or antenna of being more sensitive in one direction than in another | Synonyms: directivity |
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| (noun) the property of being directional or maintaining a direction | - |
| directioner | (noun) a fan on the band One Direction | - |
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| directionless | (adjective) aimlessly drifting | Synonyms: adrift, afloat, aimless, planless, rudderless, undirected |
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| directive | (adjective) showing the way by conducting or leading; imposing direction on | Synonyms: directing, directional, guiding |
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| (noun) a pronouncement encouraging or banning some activity | - |
| directiveness | (noun) the quality of being directive | Synonyms: directivity |
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| directivity | (noun) the property of a microphone or antenna of being more sensitive in one direction than in another | Synonyms: directionality |
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| (noun) the quality of being directive | Synonyms: directiveness |
| directly | (adverb) without deviation | Synonyms: direct, straight |
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| (adverb) in a forthright manner; candidly or frankly | Synonyms: flat, straight |
| (adverb) without anyone or anything intervening | - |
| (adverb) without delay or hesitation; with no time intervening | Synonyms: at once, forthwith, immediately, instantly, like a shot, now, right away, straight off, straightaway |
| directmate | (noun) A type of problem where White, moving first, is required to checkmate Black in a specified number of moves against any defence. | - |
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| directness | (noun) trueness of course toward a goal | Synonyms: straightness |
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| (noun) the quality of being honest and straightforward in attitude and speech | Synonyms: candidness, candor, candour, forthrightness, frankness |
| director | (noun) someone who controls resources and expenditures | Synonyms: manager, managing director |
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| (noun) the person who leads a musical group | Synonyms: conductor, music director |
| (noun) someone who supervises the actors and directs the action in the production of a show | Synonyms: theater director, theatre director |
| (noun) member of a board of directors | - |
| (noun) the person who directs the making of a film | Synonyms: film director |
| directorate | (noun) a group of persons chosen to govern the affairs of a corporation or other large institution | Synonyms: board of directors |
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| directorship | (noun) the position of a director of a business concern | - |
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| directory | (noun) an alphabetical list of names and addresses | - |
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| (noun) (computer science) a listing of the files stored in memory (usually on a hard disk) | - |
| direful | (adjective) causing fear or dread or terror | Synonyms: awful, dire, dread, dreaded, dreadful, fearful, fearsome, frightening, horrendous, horrific, terrible |
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| direfully | (adverb) in a direful manner | - |
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| dirge | (noun) a song or hymn of mourning composed or performed as a memorial to a dead person | Synonyms: coronach, lament, requiem, threnody |
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| dirham | (noun) worth one tenth of a Kuwaiti dinar; equal 100 fils | Synonyms: Kuwaiti dirham |
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| (noun) 100 dirhams equal 1 dinar in Libya | Synonyms: Libyan dirham |
| (noun) 100 dirhams equal 1 dinar in Tunisia | Synonyms: Tunisian dirham |
| (noun) the basic unit of money in Morocco; equal to 100 centimes | Synonyms: Moroccan dirham |
| (noun) the basic unit of money in the United Arab Emirates; equal to 100 fils | Synonyms: United Arab Emirate dirham |
| (noun) 100 dirhams equal 1 riyal in Qatar | Synonyms: Qatari dirham |
| dirigible | (adjective) capable of being steered or directed | Synonyms: steerable |
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| (noun) a steerable self-propelled aircraft | Synonyms: airship |
| dirk | (noun) a relatively long dagger with a straight blade | - |
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| dirndl | (noun) a dress with a tight bodice and full skirt | - |
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| (noun) a full skirt with a gathered waistband | - |
| dirt | (adjective) (of roads) not leveled or drained; unsuitable for all year travel | Synonyms: ungraded |
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| (noun) disgraceful gossip about the private lives of other people | Synonyms: malicious gossip, scandal |
| (noun) anything regarded as making something unclean | Synonyms: filth, grease, grime, grunge, soil, stain |
| (noun) the part of the earth's surface consisting of humus and disintegrated rock | Synonyms: soil |
| (noun) obscene terms for feces | Synonyms: crap, poop, shit, shite, turd |
| dirtily | (adverb) in a filthy unclean manner | Synonyms: filthily |
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| (adverb) in a sordid manner | - |
| dirtiness | (noun) obscenity in speech or writing | Synonyms: smuttiness |
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| (noun) the state of being unsanitary | Synonyms: uncleanness |
| (noun) the state of containing dirty impurities | - |
| dirty | (adjective) soiled or likely to soil with dirt or grime | Synonyms: soiled, unclean |
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| (adjective) (of behavior or especially language) characterized by obscenity or indecency | - |
| (adjective) spreading pollution or contamination; especially radioactive contamination | Synonyms: contaminating |
| (adjective) unethical or dishonest | Synonyms: shoddy, sordid |
| (adjective) expressing or revealing hostility or dislike | - |
| (adjective) obtained illegally or by improper means | Synonyms: ill-gotten |
| (adjective) (of a manuscript) defaced with changes | Synonyms: foul, marked-up |
| (adjective) (of color) discolored by impurities; not bright and clear | Synonyms: dingy, muddied, muddy |
| (adjective) vile; despicable | Synonyms: filthy, lousy |
| (adjective) contaminated with infecting organisms | Synonyms: pestiferous |
| (adjective) unpleasantly stormy | - |
| (adjective) violating accepted standards or rules | Synonyms: cheating, foul, unsporting, unsportsmanlike |
| (verb) make soiled, filthy, or dirty | Synonyms: begrime, bemire, colly, grime, soil |
| dirtying | (noun) the act of soiling something | Synonyms: soiling, soilure |
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| disa | (noun) any orchid of the genus Disa; beautiful orchids with dark green leaves and usually hooded flowers; much prized as emblematic flowers in their native regions | - |
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| disability | (noun) the condition of being unable to perform as a consequence of physical or mental unfitness | Synonyms: disablement, handicap, impairment |
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| disable | (verb) injure permanently | Synonyms: handicap, incapacitate, invalid |
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| (verb) make unable to perform a certain action | Synonyms: disenable, incapacitate |
| disabled | (adjective) the total or partial absence of a person's bodily or mental functions, including the absence of a part of a person's body | Synonyms: handicapped |
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| (noun) people collectively who are crippled or otherwise physically handicapped | Synonyms: handicapped |
| disablement | (noun) the condition of being unable to perform as a consequence of physical or mental unfitness | Synonyms: disability, handicap, impairment |
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| disabling | (adjective) depriving of legal right; rendering legally disqualified | Synonyms: disqualifying |
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| (adjective) that cripples or disables or incapacitates | Synonyms: crippling, incapacitating |
| disabuse | (verb) free somebody (from an erroneous belief) | - |
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| disabused | (adjective) freed of a mistaken or misguided notion | Synonyms: undeceived |
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| disaccharidase | (noun) an enzyme that catalyzes the hydrolysis of disaccharides into monosaccharides | - |
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| disaccharide | (noun) any of a variety of carbohydrates that yield two monosaccharide molecules on complete hydrolysis | - |
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| disaccord | (verb) be different from one another | Synonyms: disagree, discord |
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| disadvantage | (noun) the quality of having an inferior or less favorable position | - |
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| (verb) put at a disadvantage; hinder, harm | Synonyms: disfavor, disfavour |
| disadvantaged | (adjective) marked by deprivation especially of the necessities of life or healthful environmental influences | Synonyms: deprived |
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| disadvantageous | (adjective) involving or creating circumstances detrimental to success or effectiveness | Synonyms: unfavorable, unfavourable |
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| disadvantageously | (adverb) in a disadvantageous way; to someone's disadvantage | Synonyms: badly |
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| disaffect | (verb) arouse hostility or indifference in where there had formerly been love, affection, or friendliness | Synonyms: alienate, estrange |
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| disaffected | (adjective) discontented as toward authority | Synonyms: ill-affected, malcontent, rebellious |
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| disaffection | (noun) disloyalty to the government or to established authority | - |
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| (noun) the feeling of being alienated from other people | Synonyms: alienation, estrangement |
| disaffirmation | (noun) the act of asserting that something alleged is not true | Synonyms: denial |
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| disafforest | (verb) remove the trees from | Synonyms: deforest, disforest |
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| disagree | (verb) be of different opinions | Synonyms: differ, dissent, take issue |
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| (verb) be different from one another | Synonyms: disaccord, discord |
| disagreeable | (adjective) not to your liking | - |
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| (adjective) unpleasant to interact with | - |
| (adjective) not agreeing with your tastes or expectations | Synonyms: unsympathetic |
| disagreeableness | (noun) an ill-tempered and offensive disposition | - |
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| (noun) the quality of being disagreeable and unpleasant | - |
| disagreeably | (adverb) in a disagreeable manner | - |
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| disagreement | (noun) a difference between conflicting facts or claims or opinions | Synonyms: discrepancy, divergence, variance |
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| (noun) the speech act of disagreeing or arguing or disputing | - |
| (noun) a conflict of people's opinions or actions or characters | Synonyms: dissension, dissonance |
| disallow | (verb) command against | Synonyms: forbid, interdict, nix, prohibit, proscribe, veto |
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| disambiguate | (verb) state unambiguously or remove ambiguities from | - |
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| disambiguation | (noun) clarification that follows from the removal of ambiguity | - |
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