mastic

noun

1. An evergreen shrub or small tree, Pistacia lentiscus (mastic tree), native to the Mediterranean.
2. A hard, brittle, aromatic and transparent resin produced by this tree and used to make varnishes and chewing gum, and as a flavouring.
3. An alcoholic liquor flavoured with this resin.
4. A flexible, waterproof cement used as an adhesive, sealant or filler.