/ Dictionary / Index O orchidaceous: Meaning and Definition of Find definitions for: or•chi•da•ceous Pronunciation: (ôr"ki-dā'shus), [key] — adj. belonging to the plant family Orchidaceae. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orchid orchid cactus Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language