‖Hy′a‐lo‐spon″gi‐a (?), n. pl. [NL., fr. Gr. ὕαλοσ glass + � a sponge.] (Zoöl.) An order of vitreous sponges, having glassy six-rayed, siliceous spicules; — called also Hexactinellinæ.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.