Hypertext Webster Gateway: "keratosa"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Keratosa \Ker`a*to"sa\, n. pl. [NL., fr. Gr. ke`ras, -atos, a
horn.] (Zo["o]l.)
An order of sponges having a skeleton composed of hornlike
fibers. It includes the commercial sponges.
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