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

2. Resembling glass in its properties, as in smoothness, brittleness, or transparency; as, a glassy stream; a glassy surface; the glassy deep.

3. Dull; wanting life or fire; lackluster; said of the eyes. In his glassy eye.

(Science: chemical) glassy feldspar, a variety of orthoclase; sanidine.