Here’s what we discovered:
(By the way: The dude with the amazing at the end is Yossi Keller, who might know more about etrogim than any other human being alive. He runs the etrog shop in the abandoned matzah bakery on Empire Blvd. and Albany Ave. in Crown Heights, and you should check him out.)
Pronounced: ETT-rahg, Origin: Hebrew, a citron, or large yellow citrus fruit that is one of four species (the others are willow, myrtle and palm) shaken together as a ritual during the holiday of Sukkot.