Source : Webster's Revised Unabridged Dictionary (1913)

Suwarrow \Su*war"row\, n. (Bot.)
   The giant cactus ({Cereus giganteus}); -- so named by the
   Indians of Arizona. Called also {saguaro}.

Source : WordNet®

saguaro
     n : extremely large treelike cactus of desert regions of
         southwestern United States having a thick columnar
         sparsely branched trunk bearing white flowers and edible
         red pulpy fruit [syn: {sahuaro}, {Carnegiea gigantea}]
     [also: {saguaros} (pl)]