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.