/ Dictionary / Index O optometer: Meaning and Definition of Find definitions for: op•tom•e•ter Pronunciation: (op-tom'i-tur), [key] — n. any of various instruments for measuring the refractive error of an eye. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. optoelectronics optometrist Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language