Acanthocereus tetragonus Acanthocereus tetragonus /əˌkænθoʊˈsɪriəs tɛˈtræɡənəs/

noun

1. Cactus of the southwestern United States and northern Mexico having edible juicy fruit  ( Acanthocereus pentagonus , Acanthocereus tetragonus , pitahaya , pitahaya cactus )
   cactus of the southwestern United States and northern Mexico having edible juicy fruit