Polyphenolic compounds with molecular weights of around 500-3000 daltons and containing enough hydroxyl groups (1-2 per 100 MW) for effective cross linking of other compounds (ASTRINGENTS). The two main types are HYDROLYZABLE TANNINS and CONDENSED TANNINS. Historically, the term has applied to many compounds and plant extracts able to render skin COLLAGEN impervious to degradation. The word tannin derives from the Celtic word for OAK TREE which was used for leather processing.

Descriptor ID	D013634
MeSH Number(s)	D05.750.078.937
Concept/Terms	Tannins Tannins Tannic Acids Acids, Tannic Tannic Acid Acid, Tannic

Below are MeSH descriptors whose meaning is more general than "Tannins".

Below are MeSH descriptors whose meaning is related to "Tannins".

Below are MeSH descriptors whose meaning is more specific than "Tannins".