<p><strong>Noun</strong></p><ul><li>Also called mastic tree: a small Mediterranean tree, <em>Pistacia lentiscus</em>, of the cashew family, that is the source of an aromatic resin used in making varnish and adhesives.</li><li>Any of several similar or related trees, as a pepper tree, <em>Schinus molle</em>, of western South America.</li><li>The resin obtained from the mastic.</li><li>Any similar resin, especially one yielded by other trees of the same genus.</li><li>Building Trades: any of various preparations containing bituminous materials and used as an adhesive or seal.</li><li>A pasty form of cement used for filling holes in masonry or plaster.</li></ul>