Noun watch glass has 2 senses
  1. watch glass - laboratory glassware; a shallow glass dish used as an evaporating surface or to cover a beaker
    --1 is a kind of
    dish
  2. crystal, watch crystal, watch glass - a protective cover that protects the face of a watch
    --2 is a kind of protective covering, protective cover, protection
    --2 is a part of watch, ticker
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