‖ coracosteonZool.|kɒrəˈkɒstiːən| [mod.L., f.Gr. κορακο- raven + ὀστέον bone.] A term applied to an additional symmetrical osseous centre formed in the sternum in certain birds. Hence coraˈcosteala., as in coracosteal ossification. 1882in Syd. Soc.Lex.