The Collaborative International Dictionary of English v.0.48:

Corozo \Co*ro"zo\ Corosso \Co*ros"so\ (k?-r?"th? or -s?), n.
   [Cf. Sp. cerozo a kind of palm tree.]
   The name in Central America for the seed of a true palm;
   also, a commercial name for the true ivory nut. See Ivory
   nut.
   [1913 Webster]