/ Dictionary / Index R rock tripe: Meaning and Definition of Find definitions for: rock' tripe" Pronunciation: [key] any lichen of the genus Umbilicaria. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rock thrush Rockville Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language