#glass__glas  a brittle transparent solid with irregular atomic structure
  supertype:  solid  a substance that is solid at room temperature and pressure
  subtype:  natural_glass  opal_glass  optical_glass  crown_glass  soft_glass  ground_glass  ground_glass.glass  lead_glass  safety_glass  soluble_glass  stained_glass  wire_glass  Pyrex
  substance of:  glassware  plate_glass
  part of:  drinking_glass__glass__glas  a glass container for holding liquids while drinking

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