The Collaborative International Dictionary of English v.0.48:

Madeira \Ma*dei"ra\, n. [Pg., the Island Madeira, properly,
   wood, fr. L. materia stuff, wood. The island was so called
   because well wooded. See Matter.]
   A rich wine made on the Island of Madeira.
   [1913 Webster]

         A cup of Madeira, and a cold capon's leg. --Shak.
   [1913 Webster]

   Madeira nut (Bot.), the European walnut; the nut of the
      Juglans regia.
      [1913 Webster]

WordNet (r) 3.0 (2006):

Madeira
    n 1: a Brazilian river; tributary of the Amazon River [syn:
         Madeira, Madeira River]
    2: an island in the Atlantic Ocean off the coast of Africa; the
       largest of the Madeira Islands
    3: an amber dessert wine from the Madeira Islands