01 n. pl. An order of vitreous sponges, having glassy six-rayed, siliceous spicules; -- called also Hexactinellinæ.
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1.
An order of vitreous sponges, having glassy six-rayed, siliceous spicules; -- called also Hexactinellinæ.(Zool.) Also: <ord>Hexactinellinæ</ord>