mas·tic /ˈmæstɪk/
  乳香脂,乳香,灰泥之一種
  mas·tic /ˈmæstɪk/ 名詞
  膏,膠,膠粘劑
  Mas·tic n.  [Written also mastich.]
  1. Bot. A low shrubby tree of the genus Pistacia (Pistacia 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 smell, and is used as an astringent and an aromatic, also as an ingredient in varnishes.
  3. A kind of cement composed of burnt clay, litharge, and linseed oil, used for plastering walls, etc.
  Barbary mastic Bot., the Pistachia Atlantica.
  Peruvian mastic tree Bot., a small tree (Schinus Molle) with peppery red berries; -- called also pepper tree.
  West Indian mastic Bot., a lofty tree (Bursera gummifera) full of gum resin in every part.
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  mastic
       n 1: an aromatic exudate from the mastic tree; used chiefly in
            varnishes
       2: a pasty cement used as an adhesive or filler