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sealing wax

noun
🔊/ˈsiːlɪŋ wæks/
🔊/ˈsiːlɪŋ wæks/
[uncountable]
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  1. a type of wax that melts quickly when it is heated and becomes hard quickly when it cools, used in the past for sealing letters, etc.封蜡；火漆