pistachio

n. (pl. -s) 1 edible pale-green nut. 2 tree yielding this. [persian pistah]

n. The nut of the Pistacia vera, a tree of the order Anacardiaceae, 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.