| diocesan | (noun) a bishop having jurisdiction over a diocese | - |
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| diocese | (noun) the territorial jurisdiction of a bishop | Synonyms: bishopric, episcopate |
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| diode | (noun) a semiconductor that consists of a p-n junction | Synonyms: crystal rectifier, junction rectifier, semiconductor diode |
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| (noun) a thermionic tube having two electrodes; used as a rectifier | Synonyms: rectifying tube, rectifying valve |
| diol | (noun) any of a class of alcohols having 2 hydroxyl groups in each molecule | Synonyms: dihydric alcohol, glycol |
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| 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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