| diamagnet | (noun) a substance that exhibits diamagnetism | - |
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| diamagnetic | (adjective) relating to or exhibiting diamagnetism; slightly repelled by a magnet | - |
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| diamagnetism | (noun) phenomenon exhibited by materials like copper or bismuth that become magnetized in a magnetic field with a polarity opposite to the magnetic force; unlike iron they are slightly repelled by a magnet | - |
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| diamante | (noun) adornment consisting of a small piece of shiny material used to decorate clothing | Synonyms: sequin, spangle |
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| (noun) fabric covered with glittering ornaments such as sequins or rhinestones | - |
| diamantine | (adjective) consisting of diamonds or resembling diamonds | - |
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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) | - |
| diametral | (adjective) related to or along a diameter | Synonyms: diametric, diametrical |
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| diametric | (adjective) related to or along a diameter | Synonyms: diametral, diametrical |
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| (adjective) characterized by opposite extremes; completely opposed | Synonyms: diametrical, opposite, polar |
| diametrical | (adjective) related to or along a diameter | Synonyms: diametral, diametric |
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| (adjective) characterized by opposite extremes; completely opposed | Synonyms: diametric, opposite, polar |
| diametrically | (adverb) as from opposite ends of a diameter | - |
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| diamine | (noun) any organic compound containing two amino groups | - |
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| diamond | (noun) the area of a baseball field that is enclosed by 3 bases and home plate | Synonyms: baseball diamond, infield |
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| (noun) a playing card in the minor suit that has one or more red rhombuses on it | - |
| (noun) the baseball playing field | Synonyms: ball field, baseball field |
| (noun) a transparent piece of diamond that has been cut and polished and is valued as a precious gem | - |
| (noun) a parallelogram with four equal sides; an oblique-angled equilateral parallelogram | Synonyms: rhomb, rhombus |
| (noun) very hard native crystalline carbon valued as a gem | Synonyms: adamant |
| diamondback | (noun) large deadly rattlesnake with diamond-shaped markings | Synonyms: Crotalus adamanteus, diamondback rattlesnake |
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| dianoetic | (adjective) proceeding to a conclusion by reason or argument rather than intuition | Synonyms: discursive |
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| diapason | (noun) either of the two main stops on a pipe organ | Synonyms: diapason stop |
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| diapedesis | (noun) passage of blood cells (especially white blood cells) through intact capillary walls and into the surrounding tissue | - |
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| diapensia | (noun) any boreal low-growing evergreen plant of the genus Diapensia | - |
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| 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 | - |
| diaphanoscope | (noun) An instrument for illuminating the interior of a cavity to determine the translucency of its walls. | - |
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| diaphanous | (adjective) so thin as to transmit light | Synonyms: cobwebby, filmy, gauze-like, gauzy, gossamer, see-through, sheer, transparent, vaporous, vapourous |
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| diapheromera | (noun) a variety of stick insect | Synonyms: Diapheromera femorata |
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| diaphone | (noun) a foghorn that makes a signal consisting of two tones | - |
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| diaphoresis | (noun) the process of the sweat glands of the skin secreting a salty fluid | Synonyms: hidrosis, perspiration, sudation, sweating |
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| diaphoretic | (adjective) inducing perspiration | Synonyms: sudorific |
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| (noun) used to produce perspiration | - |
| diaphragm | (noun) a mechanical device in a camera that controls size of aperture of the lens | Synonyms: stop |
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| (noun) electro-acoustic transducer that vibrates to receive or produce sound waves | - |
| (noun) a contraceptive device consisting of a flexible dome-shaped cup made of rubber or plastic; it is filled with spermicide and fitted over the uterine cervix | Synonyms: contraceptive diaphragm, pessary |
| (noun) (anatomy) a muscular partition separating the abdominal and thoracic cavities; functions in respiration | Synonyms: midriff |
| diaphyseal | (adjective) relating to the diaphysis of a bone | Synonyms: diaphysial |
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| diaphysial | (adjective) relating to the diaphysis of a bone | Synonyms: diaphyseal |
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| diaphysis | (noun) the main (mid) section of a long bone | Synonyms: shaft |
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| 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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| diapsid | (noun) reptile having a pair of openings in the skull behind each eye | Synonyms: diapsid reptile |
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| diarchy | (noun) a form of government having two joint rulers | Synonyms: dyarchy |
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| diarist | (noun) someone who keeps a diary or journal | Synonyms: diary keeper, journalist |
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| diarrhea | (noun) frequent and watery bowel movements; can be a symptom of infection or food poisoning or colitis or a gastrointestinal tumor | Synonyms: diarrhoea, looseness, looseness of the bowels |
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| diarrheal | (adjective) of or relating to diarrhea | Synonyms: diarrheic, diarrhetic, diarrhoeal, diarrhoeic, diarrhoetic |
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| diarrheic | (adjective) of or relating to diarrhea | Synonyms: diarrheal, diarrhetic, diarrhoeal, diarrhoeic, diarrhoetic |
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| diarrhetic | (adjective) of or relating to diarrhea | Synonyms: diarrheal, diarrheic, diarrhoeal, diarrhoeic, diarrhoetic |
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| diarrhoea | (noun) frequent and watery bowel movements; can be a symptom of infection or food poisoning or colitis or a gastrointestinal tumor | Synonyms: diarrhea, looseness, looseness of the bowels |
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| diarrhoeal | (adjective) of or relating to diarrhea | Synonyms: diarrheal, diarrheic, diarrhetic, diarrhoeic, diarrhoetic |
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| diarrhoeic | (adjective) of or relating to diarrhea | Synonyms: diarrheal, diarrheic, diarrhetic, diarrhoeal, diarrhoetic |
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| diarrhoetic | (adjective) of or relating to diarrhea | Synonyms: diarrheal, diarrheic, diarrhetic, diarrhoeal, diarrhoeic |
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| diarthrosis | (noun) a joint so articulated as to move freely | Synonyms: articulatio synovialis, synovial joint |
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| diary | (noun) a personal journal (as a physical object) | - |
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| (noun) a daily written record of (usually personal) experiences and observations | Synonyms: journal |
| diaspora | (noun) the dispersion or spreading of something that was originally localized (as a people or language or culture) | - |
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| (noun) the body of Jews (or Jewish communities) outside Palestine or modern Israel | - |
| diastasis | (noun) separation of an epiphysis from the long bone to which it is normally attached without fracture of the bone | - |
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| diastema | (noun) a gap or vacant space between two teeth | - |
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| diastole | (noun) the widening of the chambers of the heart between two contractions when the chambers fill with blood | - |
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| diastolic | (adjective) of or relating to a diastole or happening during a diastole | - |
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| diastrophism | (noun) the process of deformation that produces continents and ocean basins in the earth's crust | - |
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| diathermy | (noun) a method of physical therapy that involves generating local heat in body tissues by high-frequency electromagnetic currents | - |
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| diathesis | (noun) constitutional predisposition to a particular disease or abnormality | - |
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| diatom | (noun) microscopic unicellular marine or freshwater colonial alga having cell walls impregnated with silica | - |
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| diatomic | (adjective) of or relating to a molecule made up of two atoms | - |
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| diatomite | (noun) a light soil consisting of siliceous diatom remains and often used as a filtering material | Synonyms: diatomaceous earth, kieselguhr |
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| diatonic | (adjective) based on the standard major or minor scales consisting of 5 tones and 2 semitones without modulation by accidentals | - |
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| (adjective) based on or using the five tones and two semitones of the major or minor scales of western music | - |
| diatribe | (noun) thunderous verbal attack | Synonyms: fulmination |
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| diazepam | (noun) a tranquilizer (trade name Valium) used to relieve anxiety and relax muscles; acts by enhancing the inhibitory actions of the neurotransmitter GABA; can also be used as an anticonvulsant drug in cases of nerve agent poisoning | Synonyms: Valium |
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| diazo | (adjective) relating to or containing diazonium | - |
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| diazonium | (noun) the univalent cation R-N:N- (where R is an aromatic hydrocarbon); found in salts that are used in manufacturing azo dyes | - |
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| diazotize | (verb) convert (an amine) into a diazo compound | - |
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| diazoxide | (noun) vasodilator (trade name Hyperstat) used to treat severe hypertension | Synonyms: Hyperstat |
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| doodia | (noun) any fern of the genus Doodia having pinnate fronds with sharply dentate pinnae | Synonyms: rasp fern |
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| encyclopaedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, cyclopedia, encyclopedia |
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| encyclopedia | (noun) a reference work (often in several volumes) containing articles on various topics (often arranged in alphabetical order) dealing with the entire range of human knowledge or with some particular specialty | Synonyms: cyclopaedia, cyclopedia, encyclopaedia |
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| epicardia | (noun) the short part of the esophagus extending downward from the diaphragm to the stomach | - |
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| epidiascope | (noun) an optical projector that gives images of both transparent and opaque objects | - |
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| epispadias | (noun) a congenital abnormality in males in which the urethra is on the upper surface of the penis | - |
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| euclidian | (adjective) relating to geometry as developed by Euclid | Synonyms: euclidean |
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| gaillardia | (noun) any plant of western America of the genus Gaillardia having hairy leaves and long-stalked flowers in hot vibrant colors from golden yellow and copper to rich burgundy | - |
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| gerardia | (noun) any plant of the genus Gerardia | - |
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| gerundial | (adjective) relating to or like a gerund | - |
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| giardia | (noun) a suspected cause of diarrhea in humans | - |
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| giardiasis | (noun) infection of the intestines with protozoa found in contaminated food and water; characterized by diarrhea and nausea and flatulence and abdominal discomfort | - |
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| gladiator | (noun) (ancient Rome) a professional combatant or a captive who entertained the public by engaging in mortal combat | - |
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| (noun) a professional boxer | Synonyms: prizefighter |
| gladiatorial | (adjective) of or relating to or resembling gladiators or their combat | - |
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| gliricidia | (noun) any of several small deciduous trees valued for their dark wood and dense racemes of nectar-rich pink flowers grown in great profusion on arching branches; roots and bark and leaves and seeds are poisonous | - |
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| guardian | (noun) a person who cares for persons or property | Synonyms: defender, protector, shielder |
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| guardianship | (noun) the responsibility of a guardian or keeper | Synonyms: keeping, safekeeping |
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| (noun) attention and management implying responsibility for safety | Synonyms: care, charge, tutelage |
| haemodialysis | (noun) dialysis of the blood to remove toxic substances or metabolic wastes from the bloodstream; used in the case of kidney failure | Synonyms: hemodialysis |
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| haemosporidian | (noun) minute protozoans parasitic at some stage of the life cycle in blood cells of vertebrates including many pathogens | - |
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| haplosporidian | (noun) parasite in invertebrates and lower vertebrates of no known economic importance | - |
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| hemodialysis | (noun) dialysis of the blood to remove toxic substances or metabolic wastes from the bloodstream; used in the case of kidney failure | Synonyms: haemodialysis |
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| hemodialyzer | (noun) a machine that uses dialysis to remove impurities and waste products from the bloodstream before returning the blood to the patient's body | Synonyms: artificial kidney |
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| hendiadys | (noun) use of two conjoined nouns instead of a noun and modifier | - |
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| hypermedia | (noun) a multimedia system in which related items of information are connected and can be presented together | Synonyms: hypermedia system, interactive multimedia, interactive multimedia system |
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| hypnopedia | (noun) teaching during sleep (as by using recordings to teach a foreign language to someone who is asleep) | Synonyms: sleep-learning |
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| hypospadias | (noun) an abnormal condition in males in which the urethra opens on the under surface of the penis | - |
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| immediacy | (noun) the quickness of action or occurrence | Synonyms: immediateness, instancy, instantaneousness |
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| (noun) lack of an intervening or mediating agency | Synonyms: immediateness |
| (noun) immediate intuitive awareness | Synonyms: immediate apprehension |
| immediate | (adjective) having no intervening medium | - |
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| (adjective) very close or connected in space or time | Synonyms: contiguous |
| (adjective) performed with little or no delay | Synonyms: prompt, quick, straightaway |
| (adjective) of the present time and place | - |
| (adjective) immediately before or after as in a chain of cause and effect | - |
| immediately | (adverb) without delay or hesitation; with no time intervening | Synonyms: at once, directly, forthwith, instantly, like a shot, now, right away, straight off, straightaway |
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| (adverb) near or close by | - |
| (adverb) bearing an immediate relation | - |
| immediateness | (noun) the quickness of action or occurrence | Synonyms: immediacy, instancy, instantaneousness |
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| (noun) lack of an intervening or mediating agency | Synonyms: immediacy |
| incendiarism | (noun) malicious burning to destroy property | Synonyms: arson, fire-raising |
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| incendiary | (adjective) involving deliberate burning of property | - |
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| (adjective) capable of catching fire spontaneously or causing fires or burning readily | - |
| (adjective) arousing to action or rebellion | Synonyms: incitive, inflammatory, instigative, rabble-rousing, seditious |
| (noun) a bomb that is designed to start fires; is most effective against flammable targets (such as fuel) | Synonyms: firebomb, incendiary bomb |
| (noun) a criminal who illegally sets fire to property | Synonyms: arsonist, firebug |
| intermediary | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediator, mediator |
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| intermediate | (adjective) lying between two extremes in time or space or state | - |
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| (adjective) around the middle of a scale of evaluation | Synonyms: average, medium |
| (noun) a substance formed during a chemical process before the desired product is obtained | - |
| (verb) act between parties with a view to reconciling differences | Synonyms: arbitrate, intercede, liaise, mediate |
| intermediately | (adverb) to an intermediate degree | - |
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| intermediation | (noun) the act of intervening for the purpose of bringing about a settlement | Synonyms: mediation |
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| intermediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, mediator |
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| invidia | (noun) spite and resentment at seeing the success of another (personified as one of the deadly sins) | Synonyms: envy |
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| irradiate | (verb) expose to radiation | Synonyms: ray |
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| (verb) cast rays of light upon | - |
| (verb) give spiritual insight to; in religion | Synonyms: enlighten |
| irradiation | (noun) (medicine) the treatment of disease (especially cancer) by exposure to a radioactive substance | Synonyms: actinotherapy, radiation, radiation therapy, radiotherapy |
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| (noun) the apparent enlargement of a bright object when viewed against a dark background | - |
| (noun) (Pavolvian conditioning) the elicitation of a conditioned response by stimulation similar but not identical to the original stimulus | - |
| (noun) (physiology) the spread of sensory neural impulses in the cortex | - |
| (noun) a column of light (as from a beacon) | Synonyms: beam, beam of light, light beam, ray, ray of light, shaft, shaft of light |
| (noun) the condition of being exposed to radiation | - |