Found 2 items, similar to tannin.
English → English (WordNet) Definition: tannin tannin n : any of various complex phenolic substances of plant origin; used in tanning and in medicine [syn: tannic acid]
English → English (gcide) Definition: tannin Tannic \Tan"nic\, a. Of or pertaining to tan; derived from, or resembling, tan; as, tannic acid. [1913 Webster] Tannic acid. (Chem.) (a) An acid obtained from nutgalls as a yellow amorphous substance, C14H10O9, having an astringent taste, and forming with ferric salts a bluish-black compound, which is the basis of common ink. Called also tannin, and gallotannic acid. (b) By extension, any one of a series of astringent substances resembling tannin proper, widely diffused through the vegetable kingdom, as in oak bark, willow, catechu, tea, coffee, etc. [1913 Webster]