/ Dictionary / Index D diffractometer: Meaning and Definition of Find definitions for: dif•frac•tom•e•ter Pronunciation: (di-frak-tom'i-tur, dif"rak-), [key] — n. Physics. an instrument that is used to study atomic crystal structure by measuring the angles at which x-rays, neutrons, or electrons are diffracted by matter. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diffractive diffusate Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language