/ Dictionary / Index C cyperaceous: Meaning and Definition of Find definitions for: cy•per•a•ceous Pronunciation: (sī"pu-rā'shus, sip"u-), [key] — adj. belonging to the Cyperaceae, the sedge family of plants. Cf. sedge family. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. CYO cypher Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language