'Keratosa' definitions:

Definition of 'Keratosa'

From: GCIDE

Keratosa \Ker`a*to"sa\, n. pl. [NL., fr. Gr. ke`ras, -atos, a horn.] (Zool.) An order of sponges having a skeleton composed of hornlike fibers. It includes the commercial sponges. [1913 Webster]