/ Dictionary / Index C cissoid: Meaning and Definition of Find definitions for: cis•soid Pronunciation: (sis'oid), [key] — n. Geom. a curve having a cusp at the origin and a point of inflection at infinity. Equation:= 2asin&thgr;tan&thgr;. r Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cisplatin cissus Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language