/ Dictionary / Index R rock flower: Meaning and Definition of Find definitions for: rock' flow"er Pronunciation: [key] any shrub of the genus Crossosoma, native to the arid regions of the southwestern U.S., having thick, narrow leaves and solitary flowers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rock flour Rockford Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language