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A siliceous sponge, of the genus Hyalonema, and allied genera; -- so called from their glassy fibers or spicules; -- called also vitreous sponge. See Glass-rope, and Euplectella.

uina. -- Cup sponge, a toilet sponge growing in a cup-shaped form. -- Glass sponge. See Glass-sponge, in the Vocabulary. -- Glove sponge, a variety of commercial sponge (Spongia officinalis, variety tubulufera), having very fine fibers, native of Florida, and the West Indies. -- Grass sponge, any one of several var…