Mastic

n. resin taken from the bark of the mastic tree and used to produce varnish

Mastic (Pistacia lentiscus) is an evergreen shrub or small tree growing to 3–4 m tall, mainly cultivated for its aromatic resin on the  Greek island of Chios,. It is native throughout the Mediterranean region, from Morocco and Iberia at the east through southern France and Turkey to Syria and Israel in the west; it is also native on the Canary Islands. The word mastic derives either from a Phoenician word or from the Greek verb mastichein ("to gnash the teeth", origin of the English word masticate) or massein ("to chew").
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Noun
1. an aromatic exudate from the mastic tree; used chiefly in varnishes
(hypernym) natural resin
2. a pasty cement used as an adhesive or filler
(hypernym) cement

adj. mastic

n. mastic, resin taken from the bark of the mastic tree and used to produce varnish

(n.)
A resin exuding from the mastic tree, and obtained by incision. The best is in yellowish white, semitransparent tears, of a faint smell, and is used as an astringent and an aromatic, also as an ingredient in varnishes.
  

(n.)
A low shrubby tree of the genus Pistacia (P. Lentiscus), growing upon the islands and coasts of the Mediterranean, and producing a valuable resin; -- called also, mastic tree.
  

(n.)
A kind of cement composed of burnt clay, litharge, and linseed oil, used for plastering walls, etc.