The Collaborative International Dictionary of English v.0.48:

Cocoa \Co"coa\, n. [Corrupted fr. cacao.]
   A preparation made from the seeds of the chocolate tree, and
   used in making, a beverage; also the beverage made from cocoa
   or cocoa shells.
   [1913 Webster]

   Cocoa shells, the husks which separate from the cacao seeds
      in preparing them for use.
      [1913 Webster] coconut