/ Dictionary / Index O orthorhombic: Meaning and Definition of Find definitions for: or•tho•rhom•bic Pronunciation: (ôr"thu-rom'bik), [key] — adj. Crystall. noting or pertaining to a system of crystallization characterized by three unequal axes intersecting at right angles; rhombic; trimetric. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthoptics orthoscope Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language