/ Dictionary / Index R redtop: Meaning and Definition of Find definitions for: red•top Pronunciation: (red'top"), [key] — n. any of several grasses of the genus Agrostis having reddish panicles, as A. gigantea, widely cultivated for lawns and pasturage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. red tide red trillium Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language