mastic
noun/ˈmæstɪk/
/ˈmæstɪk/
[uncountable]- a substance that comes from the bark of a tree and is used in making varnish
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- a substance that is used in building to fill holes and keep out water
Word Originlate Middle English: via Old French and Latin from Greek mastikhē (perhaps from mastikhan ‘masticate’).
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mastic