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.
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         A cup of Madeira, and a cold capon's leg. --Shak.
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   Madeira nut (Bot.), the European walnut; the nut of the
      Juglans regia.
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