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. [1913 Webster]
Cactus wren(Zoöl.), an American wren of the genus Campylorhynchus, of several species.