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From The Collaborative International Dictionary of English v.0.48:
Glassy \Glass"y\, 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]