The Collaborative International Dictionary of English v.0.48:

Rocoa \Ro"coa\, n. [Cf. F. rocou, roicou, Pg. & Braz, uruc['u].]
   The orange-colored pulp covering the seeds of the tropical
   plant Bixa Orellana, from which annotto is prepared. See
   Annoto.
   [1913 Webster]