Cactus \Cac"tus\, n.; pl. E. Cactuses, Cacti (-t[=i]). [L., a kind of cactus, Gr. ??????.]

(Bot.) Any plant of the order Cactac[ae], 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 (Zo["o]l.), an American wren of the genus Campylorhynchus, of several species.

Source: Webster's Revised Unabridged Dictionary (1913)