Pronunciation: (kak'tus), [key]
—pl. -tiPronunciation: (-tī), [key] -tus•es, -tus.
any of numerous succulent plants of the family Cactaceae, of warm, arid regions of the New World, having fleshy, leafless, usually spiny stems, and typically having solitary, showy flowers.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.