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From The Collaborative International Dictionary of English v.0.48:
Cactus \Cac"tus\, n.; pl. E. Cactuses, Cacti (-t[imac]). [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. [1913 Webster] Cactus wren (Zool.), an American wren of the genus Campylorhynchus, of several species. [1913 Webster]