The Collaborative International Dictionary of English v.0.48:

Corneous \Cor"ne*ous\ (-?s), a. [L. corneus, fr. cornu horn.]
   Of a texture resembling horn; horny; hard. -- Sir T. Browne.
   [1913 Webster]

WordNet (r) 3.0 (2006):

corneous
    adj 1: made of horn (or of a substance resembling horn) [syn:
           corneous, hornlike, horny]