/ Dictionary / Index O ortho-cousin: Meaning and Definition of Find definitions for: or•tho-cous•in Pronunciation: (ôr"thu-kuz'un, ôr'thu-kuz"-), [key] — n. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthoclastic ortho-dichlorobenzene Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language