Meaning

noun an aromatic exudate from the mastic tree; used chiefly in varnishes

noun a pasty cement used as an adhesive or filler

noun an evergreen shrub of the Mediterranean region that is cultivated for its resin

originFrom Middle English mastik, from Old French mastic, from Latin mastiche, from Ancient Greek μαστίχη (mastíkhē), from μαστιχάω (mastikháō, “to chew”) (note the chewing gum sense). Related to masticate. The broad sense for cements came via extension from predecessor cements made with the tree's resin. Doublet of mastika.

Etymology from Wiktionary, CC BY-SA 3.0