‖Te‐trac′ti‐nel″li‐da (?), n. pl. [NL., from Gr. τέτρα- tetra- + �, �, ray, spoke.] (Zoöl.) A division of Spongiæ in which the spicules are siliceous and have four branches diverging at right angles. Called also Tetractinellinæ.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.