/ Dictionary / Index C cotton grass: Meaning and Definition of Find definitions for: cot'ton grass" Pronunciation: [key] any rushlike plant constituting the genus Eriophorum, of the sedge family, common in swampy places and bearing spikes resembling tufts of cotton. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cotton gin cotton gum Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language