#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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