CACTI

CACTUS

cactus

(noun) any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines

Source: WordNet® 3.1

Noun

cacti

plural of cactus

Source: Wiktionary

CACTUS

Cac"tus, n. ; pl. E. Cactuses, Cacti (-ti). Etym: [L., a kind of cactus, Gr. (Bot.)

Definition: Any plant of the order Cactacæ, as the prickly pear and the night-blooming cereus. See Cereus. They usually have leafless stems and branches, often beset with clustered thorns, and are mostly natives of the warmer parts of America. Cactus wren (Zoöl.), an American wren of the genus Campylorhynchus, of several species.

Source: Webster’s Unabridged Dictionary 1913 Edition