/ Dictionary / Index R Rock Island: Meaning and Definition of Find definitions for: Rock' Is'land Pronunciation: [key] a port in NW Illinois, on the Mississippi: government arsenal. 47,036. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rocking valve rock jasmine Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language