\Pis*ta"chio\, n.
1. The small anacardiaceous tree, of southern Europe and Asia
   Minor, which bears the pistachio nut.
2. (Cookery) The flavor of the pistachio nut, or an ice or
   confection flavored with it.
3. Pistachio green.

\Pis*ta"chio\, n. [It. pistacchio (cf. Sp. pistacho,
F. pistache), fr. L. pistacium, Gr. ?, ?, fr. Per. pistah.
Cf. {Fistinut}.] (Bot.)
The nut of the {Pistacia vera}, a tree of the order
{Anacardiace[ae]}, 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}.]