Pis·tache n.  Bot. The anacardiaceous tree Pistacia vera, which yields the pistachio nut; also, the nut itself and the flavoring extract prepared from it.  Called also pistachio.
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 Pis·ta·chio n.  Bot. The nut of the Pistacia vera, a tree of the order Anacardiaceæ, containing a kernel of a pale greenish color, which has a pleasant taste, resembling that of the almond, and yields an oil of agreeable taste and odor; -- called also pistachio nut. It is wholesome and nutritive. The tree grows in Arabia, Persia, Syria, and Sicily. [Written also pistachia.]
 2. The small anacardiaceous tree (Pistacia vera), of southern Europe and Asia Minor, which bears the pistachio nut.  Called also pistache.
 3.  Cookery The flavor of the pistachio nut, or an ice or confection flavored with it.
 4.  Pistachio green.
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 Pis·ta·ci·a n.  Bot. The name of a genus of trees, including the tree which bears the pistachio (Pistacia vera), the Mediterranean mastic tree (Pistacia Lentiscus), and the species (Pistacia Terebinthus) which yields Chian or Cyprus turpentine.
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 Pistacia vera
      n : small tree of southern Europe and Asia Minor bearing small
          hard-shelled nuts [syn: pistachio, pistachio tree]