Keratosa

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]