mastic
noun /ˈmæstɪk/
/ˈmæstɪk/
[uncountable]- a substance that comes from the bark of a tree and is used in making varnish
- 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’).