From The Collaborative International Dictionary of English v.0.48 [gcide]:
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