A western Asian tree (Citrus medica var. etrog) having white flowers and sour yellow fruit.
The fruit of this tree, used ceremonially in the Jewish festival of Sukkot.
Origin of etrog
- Aramaic and Mishnaic Hebrew ’etrōg from Middle Persian wādrang citron Sankrit māṭuluṅgam from a source akin to Tamil mātaḷai, mātuḷai Malayalam mātalam
From American Heritage Dictionary of the English Language, 5th Edition