tannin

tannin
Any one of a group of complex nonuniform plant constituents that can be classified into hydrolyzable tannins (esters of a sugar, usually glucose, and one or several trihydroxybenzenecarboxylic acids) and condensed tannins (derivatives of flavonols). Tannins are used in tanning, dyeing, photography, and as clarifying agents for beer and wine. Sometimes used synonymously with tannic acid. Tannins form black stains in the presence of iron.

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tan·nin 'tan-ən n
1) any of various soluble astringent complex phenolic substances of plant origin used in tanning, dyeing, the making of ink, and in medicine as astringents and formerly in the treatment of burns
2) a substance that has a tanning effect

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tan·nin (tanґin) tannic acid.

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  • Tannin — bezeichnet eine chemische Verbindung, siehe Gallotannin Gruppe von chemischen Verbindungen, siehe Tannine, Tannin Verfahren ein Wesen aus der (hebräischen) Mythologie, siehe Tannin (Mythologie) Siehe auch Tanin …   Deutsch Wikipedia

  • tannin — (n.) vegetable substance capable of converting animal hide to leather, 1802, from Fr. tannin (1798), from tan crushed oak bark containing tannin (see TAN (Cf. tan) (v.)). Tannic acid first recorded 1836, from Fr. acide tannique, inroduced 1834 by …   Etymology dictionary

  • Tannin — Tan nin, n. [Cf. F. tannin.] (Chem.) Same as {Tannic acid}, under {Tannic}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Tannin — Tannin, so v.w. Gerbstoff …   Pierer's Universal-Lexikon

  • Tannīn — Tannīn, s. Gerbsäuren …   Meyers Großes Konversations-Lexikon

  • Tannin — Tannin, s. Gerbsäure …   Lexikon der gesamten Technik

  • Tannin — Tannīn, s. Gerbsäuren …   Kleines Konversations-Lexikon

  • Tannin — Tannin, acidum Tannicum, s. Gerbesäuren …   Herders Conversations-Lexikon

  • tannin — ► NOUN ▪ a yellowish or brownish bitter tasting organic substance present in tea, some barks, grapes, etc. DERIVATIVES tannic adjective. ORIGIN French tanin, from tan tanbark …   English terms dictionary

  • tannin — [tan′in] n. [Fr tanin < tan, TAN1 + in, IN1] any of a group of naturally occurring phenolic compounds that precipitate proteins, alkaloids, and glucosides from solution, and convert hide into leather, including tannic acid: some are present in …   English World dictionary

  • Tannin — For other uses, see Tannin (demon). Tannic acid …   Wikipedia

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