| diffraction grating |
optical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum
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| diffuse |
move outward; "The soldiers fanned out" spread out; not concentrated in one place; "a large diffuse organization" permeate: spread or diffuse through; "An atmosphere of distrust has permeated this administration"; "music penetrated the entire building"; "His campaign was riddled with accusations and personal attacks" soft: (of light) transmitted from a broad light source or reflected circulate: cause to become widely known; "spread information"; "circulate a rumor"; "broadcast the news" lacking conciseness; "a diffuse historical novel"
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| diffusion |
(physics) the process of diffusing; the intermingling of molecules in gases and liquids as a result of random thermal agitation the spread of social institutions (and myths and skills) from one society to another dissemination: the property of being diffused or dispersed dispersion: the act of dispersing or diffusing something; "the dispersion of the troops"; "the diffusion of knowledge"
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| differentiate |
distinguish: mark as different; "We distinguish several kinds of maple" distinguish: be a distinctive feature, attribute, or trait; sometimes in a very positive sense; "His modesty distinguishes him from his peers" calculate a derivative; take the derivative become different during development; "cells differentiate" speciate: evolve so as to lead to a new species or develop in a way most suited to the environment become distinct and acquire a different character
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| differential |
derived function: the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx relating to or showing a difference; "differential treatment" a quality that differentiates between similar things differential gear: a bevel gear that permits rotation of two shafts at different speeds; used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves involving or containing one or more derivatives; "differential equation"
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