Definition of mastics:
(n) :
A hard, brittle, aromatic and transparent resin produced by this tree and used to make varnishes and chewing gum, and as a flavouring.
(n) :
An evergreen shrub or small tree, Pistacia lentiscus (mastic tree), native to the Mediterranean.
(n) :
(especially Commonwealth English) Any of various cements, usually flexible and waterproof, used as an adhesive, sealant, caulk, or filler.
(n) :
An alcoholic liquor flavoured with this resin.