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diopter a unit of measure of the refractive power of a lens, equal to the power of a lens with a one-meter focal length.
diorama a scene represented by three-dimensional objects placed in front of a painted background, as in a natural history museum. [2 definitions]
dioxide a compound containing two atoms of oxygen bound to a single atom of another element.
dioxin a highly poisonous hydrocarbon that occurs as an impurity in some herbicides, defoliants, and other chemical compounds, and sometimes as a byproduct of incineration.
dip to immerse partially or temporarily in or as if in a liquid; dunk. [15 definitions]
diphenyl a pleasant-smelling crystalline compound used in preserving fruit and making dyes; biphenyl.
diphtheria a severe contagious bacterial infection whose symptoms are high fever and difficulty in breathing.
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]