Glass  —n. 1 a (often attrib.) Hard, brittle, usu. Transparent substance, made by fusing sand with soda and lime etc. B substance of similar properties. 2 glass objects collectively. 3 a glass drinking vessel. B its contents. 4 mirror. 5 glazed frame for plants. 6 barometer. 7 covering of a watch-face. 8 lens. 9 (in pl.) A spectacles. B binoculars. —v. (usu. As glassed adj.) Fit with glass.  glassful n. (pl. -s). [old english]