Webster's English Dictionary

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vitreous

vit.re.ous \'vi-tre--*s\ aj [L vitreus, fr. vitrum glass - more at WOAD] 1: 
   of, relating to, derived from, or consisting of glass  2: resembling glass 
   (as in color, composition, brittleness, or luster) :  GLASSY {~ rocks} 3: 
   of, relating to, or constituting the vitreous humor  - vit.re.ous.ly av