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A pitaya or pitahaya is the fruit of several cactus species, most importantly of the genus Hylocereus (sweet pitayas). These fruits are commonly known as dragon fruit – cf. Chinese huǒ lóng guǒ 火龍果/火龙果 "fire dragon fruit" and lóng zhū guǒ "dragon pearl fruit", Vietnamese thanh long (sweet dragon), Indonesian and Malaysian buah naga "dragon fruit", Lao: mark mang gohn (ໝາກມັງກອນ) "dragon fruit". Other vernacular names are strawberry pear or nanettikafruit.
If not otherwise stated, this article's content refers specifically to the pitayas of Hylocereus species, or "dragon fruit".

http://en.wikipedia.org/wiki/Pitaya