/ Dictionary / Index I iridescent seaweed: Meaning and Definition of Find definitions for: ir'ides'cent sea'weed Pronunciation: [key] a red alga, Irideae cordata, found on the Pacific coast of North America, having broad, leathery, iridescent blades. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. iridescent iridic Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language