Meaning

noun small tree of southern Europe and Asia Minor bearing small hard-shelled nuts

noun nut of Mediterranean trees having an edible green kernel

originFrom Italian pistacchio (1590s), from Latin pistācium (“pistachio”), from Ancient Greek πιστάκιον (pistákion), from πιστάκη (pistákē, “pistachio tree”), of Iranian origin. Compare Middle English pistace (from Middle French pistace, pistache), Northern Kurdish pisteq, Persian پسته (peste), Middle Persian pstk' (pistag, “pistachio nut”), Old Armenian պիստակ (pistak) (from Iranian), Arabic فُسْتُق…

Etymology from Wiktionary, CC BY-SA 3.0