From Russian фиста́шка (fistáška, “pistachio”), from Ottoman Turkish فستق (fıstıq), from Persian فستق (fostoq, fostaq), from Arabic فِسْتَق (fistaq), of Iranian origin.
פֿיסטאַשקע • (fistashke) f, plural פֿיסטאַשקעס (fistashkes)