‖Ker′a‐to″sa (?), n. pl. [NL., fr. Gr. κέρασ, -ατοσ, a horn.] (Zoöl.) An order of sponges having a skeleton composed of hornlike fibers. It includes the commercial sponges.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.