| denominator | (noun) the divisor of a fraction | - |
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| densimeter | (noun) a measuring instrument for determining density or specific gravity | Synonyms: densitometer |
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| densitometer | (noun) a measuring instrument for determining optical or photographic density | - |
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| (noun) a measuring instrument for determining density or specific gravity | Synonyms: densimeter |
| deodar | (noun) tall East Indian cedar having spreading branches with nodding tips; highly valued for its appearance as well as its timber | Synonyms: Cedrus deodara, deodar cedar, Himalayan cedar |
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| departer | (noun) someone who leaves | Synonyms: goer, leaver |
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| depilator | (noun) a cosmetic for temporary removal of undesired hair | Synonyms: depilatory, epilator |
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| deposer | (noun) a person who testifies or gives a deposition | Synonyms: deponent, testifier |
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| depositor | (noun) a person who has deposited money in a bank or similar institution | - |
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| depreciator | (noun) one who disparages or belittles the worth of something | Synonyms: detractor, disparager, knocker |
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| depressor | (noun) a device used by physician to press a part down or aside | - |
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| (noun) any skeletal muscle that draws a body part down | Synonyms: depressor muscle |
| (noun) any nerve whose activity tends to reduce the activity or tone of the body part it serves | Synonyms: depressor nerve |
| derringer | (noun) a pocket pistol of large caliber with a short barrel | - |
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| descender | (noun) (printing) the part of lowercase letters that extends below the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending below other lowercase letters | - |
| (noun) someone who descends | - |
| descriptor | (noun) a piece of stored information that is used to identify an item in an information storage and retrieval system | - |
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| (noun) the phonological or orthographic sound or appearance of a word that can be used to describe or identify something | Synonyms: form, signifier, word form |
| deserter | (noun) a person who abandons their duty (as on a military post) | Synonyms: defector |
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| (noun) a disloyal person who betrays or deserts his cause or religion or political party or friend etc. | Synonyms: apostate, ratter, recreant, renegade, turncoat |
| designer | (noun) someone who creates plans to be used in making something (such as buildings) | Synonyms: architect |
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| (noun) someone who designs clothing | Synonyms: clothes designer, couturier, fashion designer |
| (noun) a person who specializes in interior design | Synonyms: interior designer |
| (noun) a person who devises plots or intrigues | Synonyms: intriguer |
| (noun) someone who specializes in graphic design | Synonyms: graphic designer |
| despair | (noun) the feeling that everything is wrong and nothing will turn out well | - |
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| (noun) a state in which all hope is lost or absent | Synonyms: desperation |
| (verb) abandon hope; give up hope; lose heart | - |
| despoiler | (noun) someone who takes spoils or plunder (as in war) | Synonyms: freebooter, looter, pillager, plunderer, raider, spoiler |
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| destroyer | (noun) a small fast lightly armored but heavily armed warship | Synonyms: guided missile destroyer |
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| (noun) a person who destroys or ruins or lays waste to | Synonyms: ruiner, undoer, uprooter, waster |
| detector | (noun) any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner | Synonyms: sensing element, sensor |
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| (noun) electronic equipment that detects the presence of radio signals or radioactivity | - |
| (noun) rectifier that extracts modulation from a radio carrier wave | Synonyms: demodulator |
| deter | (verb) turn away from by persuasion | Synonyms: dissuade |
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| (verb) try to prevent; show opposition to | Synonyms: discourage |
| determiner | (noun) a determining or causal element or factor | Synonyms: causal factor, determinant, determinative, determining factor |
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| (noun) one of a limited class of noun modifiers that determine the referents of noun phrases | Synonyms: determinative |
| (noun) an argument that is conclusive | Synonyms: clincher, determining factor |
| detonator | (noun) a mechanical or electrical explosive device or a small amount of explosive; can be used to initiate the reaction of a disrupting explosive | Synonyms: cap, detonating device |
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| detour | (noun) a roundabout road (especially one that is used temporarily while a main route is blocked) | Synonyms: roundabout way |
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| (verb) travel via a detour | - |
| detractor | (noun) one who disparages or belittles the worth of something | Synonyms: depreciator, disparager, knocker |
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| developer | (noun) photographic equipment consisting of a chemical solution for developing film | - |
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| (noun) someone who develops real estate (especially someone who prepares a site for residential or commercial use) | - |
| deviser | (noun) a person who makes plans | Synonyms: contriver, planner |
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| devisor | (noun) someone who devises real property in a will | - |
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| devoir | (noun) formal expression of respect | - |
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| devour | (verb) eat greedily | Synonyms: guttle, pig, raven |
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| (verb) eat up completely, as with great appetite | Synonyms: consume, demolish, down, go through |
| (verb) to consume | - |
| (verb) enjoy avidly | - |
| devourer | (noun) someone who eats greedily or voraciously | - |
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| dexter | (adjective) on or starting from the wearer's right | - |
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| dialyzer | (noun) a medical instrument for separating substances in solution by unequal diffusion through semipermeable membranes | Synonyms: dialysis machine |
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| diameter | (noun) the length of a straight line passing through the center of a circle and connecting two points on the circumference | Synonyms: diam |
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| (noun) a straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface) | - |
| diaper | (noun) garment consisting of a folded cloth drawn up between the legs and fastened at the waist; worn by infants to catch excrement | Synonyms: napkin, nappy |
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| (noun) a fabric (usually cotton or linen) with a distinctive woven pattern of small repeated figures | - |
| diapir | (noun) a domed rock formation where a core of rock has moved upward and pierced through the more brittle overlying strata | - |
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| dibber | (noun) a wooden hand tool with a pointed end; used to make holes in the ground for planting seeds or bulbs | Synonyms: dibble |
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| dicer | (noun) a mechanical device used for dicing food | - |
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| dicker | (verb) negotiate the terms of an exchange | Synonyms: bargain |
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| dictator | (noun) a ruler who is unconstrained by law | Synonyms: potentate |
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| (noun) a person who behaves in a tyrannical manner | Synonyms: authoritarian |
| (noun) a speaker who dictates to a secretary or a recording machine | - |
| didder | (verb) move with or as if with a tremor | Synonyms: shake |
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| diemaker | (noun) someone who makes dies | Synonyms: die-sinker, diesinker |
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| diesinker | (noun) someone who makes dies | Synonyms: die-sinker, diemaker |
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| dieter | (noun) a person who diets | - |
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| differ | (verb) be of different opinions | Synonyms: disagree, dissent, take issue |
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| (verb) be different | - |
| differentiator | (noun) a person who (or that which) differentiates | Synonyms: discriminator |
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| diffuser | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffusor |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffusor |
| diffusor | (noun) optical device that distributes the light of a lamp evenly | Synonyms: diffuser |
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| (noun) baffle that distributes sound waves evenly | Synonyms: diffuser |
| digester | (noun) autoclave consisting of a vessel in which plant or animal materials are digested | - |
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| digger | (noun) a machine for excavating | Synonyms: excavator, power shovel, shovel |
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| (noun) a laborer who digs | - |
| digitiser | (noun) device for converting analogue signals into digital signals | Synonyms: analog-digital converter, analog-to-digital converter, digitizer |
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| digitizer | (noun) device for converting analogue signals into digital signals | Synonyms: analog-digital converter, analog-to-digital converter, digitiser |
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| dilater | (noun) a surgical instrument that is used to dilate or distend an opening or an organ | Synonyms: dilator |
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| dilator | (noun) a surgical instrument that is used to dilate or distend an opening or an organ | Synonyms: dilater |
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| (noun) a drug that causes dilation | - |
| (noun) a muscle or nerve that dilates or widens a body part | - |
| dillydallier | (noun) someone who wastes time | Synonyms: dallier, dilly-dallier, lounger, mope |
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| dimer | (noun) a compound whose molecules are composed of two identical monomers | - |
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| dimmer | (noun) a rheostat that varies the current through an electric light in order to control the level of illumination | - |
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| dinar | (noun) the basic unit of money in Algeria | Synonyms: Algerian dinar |
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| (noun) the basic unit of money in Bahrain; equal to 1,000 fils | Synonyms: Bahrain dinar |
| (noun) the basic unit of money in Iraq; equal to 1,000 fils | Synonyms: Iraqi dinar |
| (noun) the basic unit of money in Jordan; equal to 1,000 fils | Synonyms: Jordanian dinar |
| (noun) the basic unit of money in Kuwait; equal 1,000 fils | Synonyms: Kuwaiti dinar |
| (noun) the basic unit of money in Libya | Synonyms: Libyan dinar |
| (noun) the basic unit of money in Tunisia | Synonyms: Tunisian dinar |
| (noun) the basic unit of money in Yugoslavia | Synonyms: Yugoslavian dinar |
| (noun) 100 dinars equal 1 rial in Iran | Synonyms: Iranian dinar |
| diner | (noun) a passenger car where food is served in transit | Synonyms: buffet car, dining car, dining compartment |
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| (noun) a restaurant that resembles a dining car | - |
| (noun) a person eating a meal (especially in a restaurant) | - |
| dinner | (noun) the main meal of the day served in the evening or at midday | - |
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| (noun) a party of people assembled to have dinner together | Synonyms: dinner party |
| dinosaur | (noun) any of numerous extinct terrestrial reptiles of the Mesozoic era | - |
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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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| dipolar | (adjective) having equal and opposite electric charges or magnetic poles having opposite signs and separated by a small distance | - |
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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 | - |
| directioner | (noun) a fan on the band One Direction | - |
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| 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 |
| disambiguator | (noun) (computer science) a natural language processing application that tries to determine the intended meaning of a word or phrase by examining the linguistic context in which it is used | - |
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| disappear | (verb) get lost, as without warning or explanation | Synonyms: go away, vanish |
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| (verb) cease to exist | Synonyms: vanish |
| (verb) become less intense and fade away gradually | Synonyms: evaporate, melt |
| (verb) become invisible or unnoticeable | Synonyms: go away, vanish |
| disarmer | (noun) someone opposed to violence as a means of settling disputes | Synonyms: pacificist, pacifist |
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| disaster | (noun) an act that has disastrous consequences | - |
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| (noun) an event resulting in great loss and misfortune | Synonyms: calamity, cataclysm, catastrophe, tragedy |
| (noun) a state of extreme (usually irremediable) ruin and misfortune | Synonyms: catastrophe |
| disbar | (verb) remove from the bar; expel from the practice of law by official action | - |
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| disburser | (noun) someone who spends money to purchase goods or services | Synonyms: expender, spender |
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| disclaimer | (noun) (law) a voluntary repudiation of a person's legal claim to something | - |
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| (noun) denial of any connection with or knowledge of | Synonyms: disavowal |
| discolor | (verb) change color, often in an undesired manner | Synonyms: color, colour, discolour |
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| (verb) lose color or turn colorless | - |
| (verb) cause to lose or change color | - |
| discolour | (verb) change color, often in an undesired manner | Synonyms: color, colour, discolor |
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| discounter | (noun) a sales outlet offering goods at a discounted price | Synonyms: discount house, discount store, wholesale house |
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| discover | (verb) get to know or become aware of, usually accidentally | Synonyms: find out, get a line, get wind, get word, hear, learn, pick up, see |
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| (verb) identify as in botany or biology, for example | Synonyms: describe, distinguish, identify, key, key out, name |
| (verb) make known to the public information that was previously known only to a few people or that was meant to be kept a secret | Synonyms: break, bring out, disclose, divulge, expose, give away, let on, let out, reveal, uncover, unwrap |
| (verb) make a discovery, make a new finding | Synonyms: find |
| (verb) see for the first time; make a discovery | - |
| (verb) discover or determine the existence, presence, or fact of by perception with the eyes | Synonyms: detect, find, notice, observe |
| (verb) find unexpectedly | Synonyms: attain, chance on, chance upon, come across, come upon, fall upon, happen upon, light upon, strike |
| discoverer | (noun) someone who is the first to observe something | Synonyms: finder, spotter |
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| (noun) someone who is the first to think of or make something | Synonyms: artificer, inventor |
| discriminator | (noun) a person who (or that which) differentiates | Synonyms: differentiator |
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| disencumber | (verb) release from entanglement of difficulty | Synonyms: disentangle, extricate, untangle |
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| disentangler | (noun) a person who removes tangles; someone who takes something out of a tangled state | Synonyms: unraveler, unraveller |
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| disfavor | (noun) an inclination to withhold approval from some person or group | Synonyms: disapproval, disfavour, dislike |
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| (noun) the state of being out of favor | Synonyms: disfavour |
| (verb) put at a disadvantage; hinder, harm | Synonyms: disadvantage, disfavour |
| disfavour | (noun) an inclination to withhold approval from some person or group | Synonyms: disapproval, disfavor, dislike |
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| (noun) the state of being out of favor | Synonyms: disfavor |
| (verb) put at a disadvantage; hinder, harm | Synonyms: disadvantage, disfavor |
| dishonor | (noun) lacking honor or integrity | Synonyms: dishonour |
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| (noun) a state of shame or disgrace | Synonyms: dishonour |
| (verb) refuse to accept | Synonyms: dishonour |
| (verb) bring shame or dishonor upon | Synonyms: attaint, disgrace, dishonour, shame |
| (verb) force (someone) to have sex against their will | Synonyms: assault, dishonour, outrage, rape, ravish, violate |
| dishonour | (noun) lacking honor or integrity | Synonyms: dishonor |
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| (noun) a state of shame or disgrace | Synonyms: dishonor |
| (verb) refuse to accept | Synonyms: dishonor |
| (verb) bring shame or dishonor upon | Synonyms: attaint, disgrace, dishonor, shame |
| (verb) force (someone) to have sex against their will | Synonyms: assault, dishonor, outrage, rape, ravish, violate |
| dishwasher | (noun) a machine for washing dishes | Synonyms: dish washer, dishwashing machine |
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| (noun) someone who washes dishes | - |
| dishwater | (noun) water in which dishes and cooking utensils are washed | - |
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| disinfector | (noun) an apparatus for applying disinfectants. | - |
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| disinter | (verb) dig up for reburial or for medical investigation; of dead bodies | Synonyms: exhume |
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| dismember | (verb) separate the limbs from the body | - |
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| (verb) divide into pieces | Synonyms: discerp, take apart |
| disorder | (noun) a disturbance of the peace or of public order | - |
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| (noun) a condition in which things are not in their expected places | Synonyms: disorderliness |
| (noun) a physical condition in which there is a disturbance of normal functioning | Synonyms: upset |
| (verb) bring disorder to | Synonyms: disarray |
| (verb) disturb in mind or make uneasy or cause to be worried or alarmed | Synonyms: cark, disquiet, distract, perturb, trouble, unhinge |
| disparager | (noun) one who disparages or belittles the worth of something | Synonyms: depreciator, detractor, knocker |
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| dispatcher | (noun) the official who signals the beginning of a race or competition | Synonyms: starter |
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| (noun) employee of a transportation company who controls the departures of vehicles according to weather conditions and in the interest of efficient service | - |
| dispenser | (noun) a container so designed that the contents can be used in prescribed amounts | - |
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| (noun) a person who dispenses | - |
| disprover | (noun) a debater who refutes or disproves by offering contrary evidence or argument | Synonyms: confuter, rebutter, refuter |
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| disrepair | (noun) in need of repairs; in need of repair | - |
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| dissembler | (noun) a person who professes beliefs and opinions that he or she does not hold in order to conceal his or her real feelings or motives | Synonyms: dissimulator, hypocrite, phoney, phony, pretender |
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| disseminator | (noun) someone who spreads the news | Synonyms: propagator |
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| dissenter | (noun) a person who dissents from some established policy | Synonyms: contestant, dissident, objector, protester |
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| dissever | (verb) separate into parts or portions | Synonyms: carve up, divide, separate, split, split up |
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| dissimilar | (adjective) not similar | - |
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| (adjective) not alike or similar | Synonyms: unalike |