The Collaborative International Dictionary of English v.0.48:

mango tree \mango tree\ n.
   An East Indian tree of the genus Mangifera (Mangifera
   Indica), related to the cashew and the sumac. It grows to a
   large size, and produces a large oval smooth-skinned fruit
   which is the mango of commerce. It is now cultivated in
   tropical America.
   [1913 Webster + WordNet 1.5]

WordNet (r) 3.0 (2006):

Mangifera indica
    n 1: large evergreen tropical tree cultivated for its large oval
         fruit [syn: mango, mango tree, Mangifera indica]