Pit·a·ha·ya n.  Bot. A cactaceous shrub (Cereus Pitajaya) of tropical America, which yields a delicious fruit.
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  pitahaya
       n 1: cactus of the southwestern United States and northern Mexico
            having edible juicy fruit [syn: pitahaya cactus, Acanthocereus
            tetragonus, Acanthocereus pentagonus]
       2: highly colored edible fruit of pitahaya cactus having bright
          red juice; often as large as a peach