Etrog (Hebrew: אֶתְרוֹג, plural: etrogim; Ashkenazi Hebrew: esrog, plural: esrogim) is the yellow citron (Citrus medica) used by Jews during the weeklong holiday of Sukkot as one of the four species. Together with the lulav, hadass, and aravah, the etrog is taken in hand and held or waved during specific portions of the holiday prayers. Special care is often given to selecting an etrog for the performance of the Sukkot holiday rituals.[1]