Source : Webster's Revised Unabridged Dictionary (1913)

Mahogany \Ma*hog"a*ny\, n. [From the South American name.]
   1. (Bot.) A large tree of the genus {Swietenia} ({S.
      Mahogoni}), found in tropical America.

   Note: Several other trees, with wood more or less like
         mahogany, are called by this name; as, African mahogany
         ({Khaya Senegalensis}), Australian mahogany
         ({Eucalyptus marginatus}), Bastard mahogany ({Batonia
         apetala} of the West Indies), Indian mahogany ({Cedrela
         Toona} of Bengal, and trees of the genera {Soymida} and
         {Chukrassia}), Madeira mahogany ({Persea Indica}),
         Mountain mahogany, the black or cherry birch ({Betula
         lenta}), also the several species of {Cercocarpus} of
         California and the Rocky Mountains.

   2. The wood of the {Swietenia Mahogoni}. It is of a reddish
      brown color, beautifully veined, very hard, and
      susceptible of a fine polish. It is used in the
      manufacture of furniture.

   3. A table made of mahogany wood. [Colloq.]

   {To be under the mahogany}, to be so drunk as to have fallen
      under the table. [Eng.]

   {To put one's legs under some one's mahogany}, to dine with
      him. [Slang]

Source : WordNet®

mahogany
     n 1: wood of any of various mahogany trees; much used for
          cabinetwork and furniture
     2: any of various tropical timber trees of the family Meliaceae
        especially the genus Swietinia valued for their hard
        yellowish- to reddish-brown wood that is readily worked
        and takes a high polish [syn: {mahogany tree}]