The Collaborative International Dictionary of English v.0.48:

Mango \Man"go\, n.; pl. Mangoes. [Pg. manga, fr. Tamil
   m[=a]nk[=a]y.]
   1. The fruit of the mango tree. It is rather larger than an
      apple, and of an ovoid shape. Some varieties are fleshy
      and luscious, and others tough and tasting of turpentine.
      The green fruit is pickled for market.
      [1913 Webster]

   2. A green muskmelon stuffed and pickled.
      [1913 Webster]

   Mango bird (Zool.), an oriole (Oriolus kundoo), native of
      India.

   Mango fish (Zool.), a fish of the Ganges (Polynemus
      risua), highly esteemed for food. It has several long,
      slender filaments below the pectoral fins. It appears
      about the same time with the mango fruit, in April and
      May, whence the name.

   Mango tree (Bot.), an .
      [1913 Webster]

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):

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