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tannin n. 單寧酸 單寧酸 tannin n 1: any of various complex phenolic substances of plant origin; used in tanning and in medicine [synonym: {tannin}, {tannic acid}] 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] Tannin \Tan"nin\, n. [Cf. F. tannin.] (Chem.) Same as {Tannic acid}, under {Tannic}. [1913 Webster]
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