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diphthong a complex sound produced by moving from one vowel sound to another within a single syllable. [2 definitions]
diphthongize to pronounce as or make into a diphthong. [2 definitions]
diplodocus any of various gigantic plant-eating dinosaurs that lived during the Jurassic period.
diploid in biology, having two of each non-sex-determining chromosome in each cell. [3 definitions]
diploma a document conferring some honor or privilege, esp. a document granted by an educational institution and certifying that the recipient has completed a course of study or earned a degree.
diplomacy the practice or skill of conducting negotiations between nations or governments. [2 definitions]
diplomat an official employed to conduct negotiations between nations or governments. [2 definitions]
diplomate a person who holds a diploma, esp. a physician or engineer certified as a specialist by a board of respected professionals.
diplomatic of or pertaining to diplomacy. [2 definitions]
diplomatic immunity exemption from local laws, granted to diplomatic personnel and their dependents while in a foreign country.
diplopia a vision disorder in which two images of the same object are seen, also called double vision.
dipole a pair of electric charges or magnetic poles that are of equal magnitude but opposite polarity. [3 definitions]
dipole antenna a radio or television antenna consisting of two equal rods that extend outward in opposite directions.
dipper someone or something that dips. [4 definitions]
dippy (slang) foolish or eccentric.
dipsomania an uncontrollable, usu. periodic craving for alcoholic drink.
dipstick a rod with graduated markings used to measure the depth of a liquid, such as oil in an automobile crankcase.
dipteran of or pertaining to a two-winged insect; dipterous. [2 definitions]
dipterous of or pertaining to a dipteran. [2 definitions]
diptych an ancient writing tablet consisting of two wooden or ivory leaves that are hinged together. [2 definitions]
dire causing, likely to cause, or involving terror or suffering. [3 definitions]