Gallotannic acid, also known as tannic acid or gallotannin, is a naturally occurring compound found in various plant sources such as gallnuts. This polyphenolic substance is renowned for its astringent and antioxidant properties, making it highly valuable in numerous industries like food and pharmaceuticals. Given its significance, it is useful to be acquainted with synonyms that refer to this compound. Tannic acid, derived from the word "tannin", aptly portrays its origins and characteristics. Additionally, gallotannin and gallotannic acid are often used interchangeably when referring to this substance. These synonyms can be helpful in understanding the diverse applications and properties of gallotannic acid.