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Longman Dictionary of Contemporary English
tannin
noun
EXAMPLES FROM CORPUS
▪ It has some plummy fruit, with sufficient tannin for only £2.74.
▪ One of the problems we've had of late is the wine keeping too much tannin as it matures.
▪ Pastiche: This charming, mediumbodied red wine from Joseph Phelps offers plentiful fruit, admirable length and little tannin.
▪ Red wines are fermented at a higher temperature than whites to extract colour and tannin from the skins.
▪ The 1994, like all vintages, is a burly wine with loads of blackberry fruit and a good lashing of tannin.
▪ The best examples have a good balance of dry tannin and rich fruit.
▪ This process allows the harsh tannin to mellow and the wine to develop complexity.
▪ Those caterpillars that feed on older leaves, with a high tannin content, are less nutritious for the chicks.
The Collaborative International Dictionary
tannin

Tannic \Tan"nic\, a. Of or pertaining to tan; derived from, or resembling, tan; as, tannic acid. Tannic acid. (Chem.)

  1. 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.

  2. 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.

Douglas Harper's Etymology Dictionary
tannin

"tannic acid, vegetable substance capable of converting animal hide to leather," 1802, from French tannin (1798), from tan "crushed oak bark containing tannin" (see tan (v.)). Tannic acid first recorded 1836, from French acide tannique, inroduced 1834 by French chemist Théophile-Jules Pelouze (1807-1867).

Wiktionary
tannin

n. (context chemistry English) tannic acid or any of its derivatives.

WordNet
tannin

n. any of various complex phenolic substances of plant origin; used in tanning and in medicine [syn: tannic acid]

Wikipedia
Tannin

A tannin (or tannoid) is an astringent, polyphenolic biomolecule that binds to and precipitates proteins and various other organic compounds including amino acids and alkaloids.

The term tannin (from tanna, an Old High German word for oak or fir tree, as in Tannenbaum) refers to the use of wood tannins from oak in tanning animal hides into leather; hence the words "tan" and "tanning" for the treatment of leather. However, the term "tannin" by extension is widely applied to any large polyphenolic compound containing sufficient hydroxyls and other suitable groups (such as carboxyls) to form strong complexes with various macromolecules.

The tannin compounds are widely distributed in many species of plants, where they play a role in protection from predation, and perhaps also as pesticides, and in plant growth regulation. The astringency from the tannins is what causes the dry and puckery feeling in the mouth following the consumption of unripened fruit or red wine or tea. Likewise, the destruction or modification of tannins with time, plays an important role when determining harvesting times.

Tannins have molecular weights ranging from 500 to over 3,000 ( gallic acid esters) and up to 20,000 ( proanthocyanidins).

Tannin (monster)

Tannin or Tunannu ( Ugaritic: Tnn) was a sea monster in Canaanite, Phoenician, and Hebrew mythology used as a symbol of chaos and evil.

Tannin (disambiguation)

Tannin usually refers to astringent, bitter chemical compounds naturally occurring in plants, which are used in tanning hides and prominent in the taste of some red wines.

It may also refer to:

  • Tannin, a monster in Levantine mythology

Usage examples of "tannin".

The fodder being astringent will serve by its tannin, which is abundant, to cure or prevent looseness.

The root contains tannin and mucilage, it is therefore astringent and demulcent.

Chemically the flowers contain a yellow, odorous, buttery oil, with tannin, and malates of potash and lime, whilst the berries furnish viburnic acid.

Woodruff and brooklime, both rich in tannin, relieved burns when applied in butter with the root of a lily.

The combined writing and copying fluids, and the copying fluids on the other hand if properly made, may be justly recommended where permanency is the first requisition, particularly the older ones, which should be the most durable of all nut-gall and iron inks, because in them particularly concentration is aimed at, and the iron need not necessarily, and should not, be in excess of that required to combine with the tannin present.

The above affords a partial explanation, and seems fairly satisfactory when taken with my previous suggestion, namely, that during fermentation the bean is rendered pervious to water, which, on distributing itself throughout the bean, dissolves the isolated masses of tannin and diffuses it evenly, so that it encounters and becomes mixed with the enzymes.

I settled for a double dose of tannin secretion, an underdose of sun block, a darkened pair of mag specs, my height, and a local beard and hairstyle.

Substantially the same thing occurs with ink made with the respective acids, although the blue color remains for a time unimpaired in the tannin ink, apparently due to the fact that ferrous-tannate reduces indigo blue to indigo white, a change which the low reducing power of ferrousgallate does little to effect.

Crab Apple, armed with thorns, grows in our fields and hedgerows, furnishing verjuice, which is rich in tannin, and a most useful application for old sprains.

The last-named substance is the fruit of the Terminalia, a product of China and the East Indies, best known as Myrabolams and must have been utilized solely for the tannin they contain, which Loewe estimates to be identical with ellago-tannic acid, later discovered in the divi-divi, a fruit grown in South America, and bablah which is also a fruit of a species of Acacia, well known also for its gum.

They contain tannin, and a resinous camphire, which is common to most of the mints affording essential oils.

Such bark chemically contains cinnamic acid, tannin, a resin, and sugar, so that its continued use will induce constipation.

Ink -- Writing Inks -- Raw Materials of Tannin Inks -- The Chemical Constitution of the Tannin Inks -- Recipes for Tannin Inks -- Logwood Tannin Inks -- Ferric Inks -- Alizarine Inks--Extract Inks -- Logwood Inks -- Copying Inks -- Hektographs -- Hektograph Inks -- Safety Inks -- Ink Extracts and Powders -- Preserving Inks -- Changes in Ink and the Restoration of Faded Writing -- Coloured Inks -- Red Inks -- Blue Inks -- Violet Inks -- Yellow Inks -- Green Inks -- Metallic Inks -- Indian Ink -- Lithographic Inks and Pencils -- Ink Pencils -- Marking Inks -- Ink Specialities -- Sympathetic Inks -- Stamping Inks -- Laundry or Washing Blue -- Index.

Labiate herbs, comprising a volatile oil, some bitter principle, tannin, sugar, and cellulose.

The combined writing and copying fluids, and the copying fluids on the other hand if properly made, may be justly recommended where permanency is the first requisition, particularly the older ones, which should be the most durable of all nut-gall and iron inks, because in them particularly concentration is aimed at, and the iron need not necessarily, and should not, be in excess of that required to combine with the tannin present.