an aromatic gum or resin that exudes from the bark of a Mediterranean tree, used in making varnish and chewing gum and as a flavouring

incense made from sandalwood, eagle-wood, mastic and cloves

the bushy evergreen Mediterranean tree which yields mastic and has aromatic leaves and fruit, closely related to the pistachio

a waterproof filler and sealant used in building

run a bead of mastic along the gap

a mastic sealant

use a mastic between the joints