/ Dictionary / Index C cereus: Meaning and Definition of Find definitions for: ce•re•us Pronunciation: (sēr'ē-us), [key] — pl. -us•es. any of various plants of the genus Cereus, of the cactus family, having large, usually white, funnel-shaped flowers. any of several related, similar plants, esp. of the genera Hylocereus, Nyctocereus, and Selenicereus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cereus (Thesaurus) Ceres Cerf Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language