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resin obtained from certain trees, late 14c., from Old French mastic (13c.) and directly from Late Latin mastichum, from Latin mastiche, from Greek mastikhe, of uncertain origin, probably related to masasthai "to chew" (see mastication). The substance is used as a chewing gum in the East.
aromatic resin, obtained as a soft exudation from incisions in mastic trees. It is used chiefly to make pale varnishes for protecting metals and paintings. When dispersed in bodied (thickened by heating) linseed oil, mastic is known as megilp and is used as a colour vehicle. Mastic is also used as an adhesive in dental work