Source : Webster's Revised Unabridged Dictionary (1913)

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 : WordNet®

cactus wren
     n : large harsh-voiced American wren of arid regions of the
         United States southwest and Mexico