Webster's English Dictionary

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glass

1. glass \'glas\ \-.ma--k*r\ \-kin\ n [ME glas, fr. OE gls; akin to OE 
   geolu yellow - mo] often attrib re at YELLOW 1a: an amorphous ingorganic 
   usu. transparent or translucent substance consi sting of a mixture of 
   silicates or sometimes borates or phosphates formed by fusion of silica or 
   of oxides of boron or phosphorus with a flux and a stabilizer into a mass 
   that cools to a rigid condition without crystallization 1b: a substance 
   resembling glass  2a: something made of glass : as  2a1: TUMBLER  2a2: 
   MIRROR  2a3: BAROMETER  2b1: an optical instrument or device that has one 
   or more lenses and is des igned to aid in the viewing of objects not 
   readily seen pl  2b2: a device used to correct defects of vision or to 
   protect the eyes that  consists typically of a pair of glass lenses and the 
   frame by which they are held in place 3: the quantity held by a glass 
   container  4: GLASSWARE  - glass.mak.er n
2. glass vt 1a: GLAZE  1b: to put in a glass container  2: to make glassy  
   3a: REFLECT  3b: to see mirrored  4: to scan with an optical instrument 
   esp. for game  1: to become glassy  2: to look for game through an optical 
   instrument