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Made of glass; vitreous; as, a glassy substance. Bacon.

A mineral of the feldspar family, commonly occurring in small glassy crystals, also a constituent of some igneous rocks. It is a lime feldspar. See Feldspar.

A genus of small glassy heteropod mollusks found swimming at the surface in mid ocean. See Heteropod.

A borosilicate of alumina, iron, and lime, commonly found in glassy, brown crystals with acute edges.

Minute acicular or dendritic crystalline forms sometimes observed in glassy volcanic rocks.

A genus of oceanic heteropod Mollusca, having a thin, glassy, bonnet-shaped shell, which covers only the nucleus and gills.

A mineral occuring in glassy rhombohedral crystals, varying, in color from white to yellow or red. It is essentially a hydrous silicate of alumina and lime. Called also chabasie.

A minute mineral form like those common in glassy volcanic rocks and some slags, not having a definite crystalline outline and not referable to any mineral species, but marking the first step in the crystallization process. According to their form crystallites are called trichites, belonites, globulites, etc.…

More dances my rapt heart Than when I first my wedded mistress saw. Shak. Shadows in the glassy waters dance. Byron. Where rivulets dance their wayward round. Wordsworth. To dance on a rope, or To dance on nothing, to be hanged.

A borosilicate of lime commonly occuring in glassy,, greenish crystals. [Written also datholite.]

f devitrifying, or the state of being devitrified. Specifically, the conversion of molten glassy matter into a stony mass by slow cooling, the result being the formation of crystallites, microbites, etc., in the glassy base, which are then called devitrification products.

A glassy, opaque bead obtained by the blowpipe.

A genus of elegant, glassy sponges, consisting of interwoven siliceous fibers, and growing in the form of a cornucopia; -- called also Venus's flower-basket.

A smooth, bright, glassy surface; as, a glare of ice. [U. S. ]

Any substance having a peculiar glassy appearance, and a conchoidal fracture, and usually produced by fusion.

, first brought from Japan. It has a long stem, consisting of a bundle of long and large, glassy, siliceous fibers, twisted together.

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.

Glassy; glazed. [Obs.] And pursues the dice with glassen eyes. B. Jonson.

Glassy; shining like glass. [Obs.] "Minerva's glassful shield." Marston.

The quality of being glassy.