/ Dictionary / Index R ruinate: Meaning and Definition of Find definitions for: ru•in•ate Pronunciation: (r'u-nāt"), [key] — v., adj. -at•ed, -at•ing, —v.t. to ruin. —adj. ruined. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ruin ruination Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language