/ Dictionary / Index I iridaceous: Meaning and Definition of Find definitions for: ir•i•da•ceous Pronunciation: (ir"i-dā'shus, ī"ri-), [key] — adj. belonging to the Iridaceae family of plants. Cf. iris family. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: iridaceous (Thesaurus) irid iridectome Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language