/ Dictionary / Index C cycas: Meaning and Definition of Find definitions for: cy•cas Pronunciation: (sī'kas, -kus), [key] — n. any of several palmlike Old World tropical plants of the genus Cycas, some species of which are cultivated as ornamentals in warm climates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cycas (Thesaurus) cycadaceous cycasin Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language