The Collaborative International Dictionary of English v.0.48:

Keratose \Ker"a*tose`\, 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]

The Collaborative International Dictionary of English v.0.48:

Keratose \Ker"a*tose`\, a. (Zool.)
   Containing hornlike fibers or fibers of keratose; belonging
   to the Keratosa.
   [1913 Webster]