Synonym for mastic ... 1. <botany> 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. ... 2. A resin exuding from the mastic tree, and obtained by incision. The best is in yellowish white, semitransparent tears, of a faint... Found on http://www.encyclo.co.uk/local/20973