/ Dictionary / Index R rock crystal: Meaning and Definition of Find definitions for: rock' crys"tal Pronunciation: [key] transparent quartz, esp. when colorless. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rock cress rock dove Related Content Daily Word Quiz: supercilious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language