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Definition of mastic noun from the Oxford Advanced Learner's Dictionary

mastic

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