| 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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