a. 1. Made of glass; vitreous; as, a glassy substance. Bacon. [ 1913 Webster ]
2. Resembling glass in its properties, as in smoothness, brittleness, or transparency; as, a glassy stream; a glassy surface; the glassy deep. [ 1913 Webster ]
3. Dull; wanting life or fire; lackluster; -- said of the eyes. “In his glassy eye.” Byron. [ 1913 Webster ]
Glassy feldspar (Min.), a variety of orthoclase; sanidine. [ 1913 Webster ]