small tree of southern Europe and Asia Minor bearing small hard-shelled nuts
source: WordNet 3.0
nut of Mediterranean trees having an edible green kernel
source: WordNet 3.0
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.
source: Webster 1913
The small anacardiaceous tree, of southern Europe and Asia Minor, which bears the pistachio nut.