from the GNU version of the Collaborative International Dictionary of English
- n.pl. An order of sponges in which the skeleton consists of horny fibers. It includes all the commercial sponges.
from The Century Dictionary and Cyclopedia
- In Claus's system of classification, the second order of the class Spongiæ; the horny sponges, for the most part branched or with massive sponge-stocks, with a framework of horny fibers in which grains of silex and sand are embedded. Also Keratospongiæ.
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