Etrog is a Hebrew word that refers to a citrus fruit commonly used during the Jewish holiday of Sukkot. While etrog is the most commonly used term, there are other synonyms for this fruit. In Hebrew, another term that can be used is "citron." The Aramaic term is "tapuach haSisra," and in Yiddish, it can be referred to as "etzies." In some regions, it is also known as "hadar," which means "beautiful." Additionally, in the Sephardic tradition, the etrog is sometimes called the "pri etz hadar," which means "fruit of a beautiful tree." Regardless of the term used, the etrog is an integral part of Sukkot celebrations and symbolizes both joy and gratitude.