watch glass

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. laboratory glassware;
a shallow glass dish used as an evaporating surface or to cover a beaker
• Hypernyms:
dish
2. a protective cover that protects the face of a watch
• Syn:
crystal, watch crystal
• Hypernyms:
protective covering, protective cover, protection
• Part Holonyms:
watch, ticker