a. (Zool.) Containing hornlike fibers or fibers of keratose; belonging to the Keratosa. [ 1913 Webster ]

n. [ Gr. ke`ras, -atos, horn. ] (Physiol. Chem.) A tough, horny animal substance entering into the composition of the skeleton of sponges, and other invertebrates; -- called also keratode. [ 1913 Webster ]