[ 'mastɪk ]
■ noun
1》 an aromatic gum or resin exuded from the bark of a Mediterranean tree, used in making varnish and chewing gum and as a flavouring.
2》 the bushy evergreen Mediterranean tree which yields ~, closely related to the pistachio. [ Pistacia lentiscus .]
↘used in names of similar or related trees, e.g. American ~ .
3》 a putty-like waterproof filler and sealant used in building.
Origin
ME: via OFr. and L. from Gk mastikhē (perh. from mastikhan '~ate').