/ Dictionary / Index D dioptometer: Meaning and Definition of Find definitions for: di•op•tom•e•ter Pronunciation: (dī"op-tom'i-tur), [key] — n. Ophthalm. an instrument for measuring the refraction of the eye. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. diopter dioptric Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language