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tannic a. 丹宁的,得自鞣革的 丹宁的,得自鞣革的 tannic adj 1: derived from tanninTannic \ 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]
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