One of the mysteries of the English language finally explained.
A yellowish or brownish bitter-tasting organic substance present in some galls, barks, and other plant tissues, consisting of derivatives of gallic acid, used in leather production and ink manufacture.
- ‘The association of tannin with caffeine allows the caffeine to be released slowly into the blood.’
- ‘The result is a fruity wine, high in aromatics and low in tannin.’
- ‘If you take any grape - black, red or green - and slice it through the middle it looks much the same: the stalk is woody and full of a substance called tannin.’
- ‘Additionally, the content of another product of the phenyl propanoid pathway, tannin, was examined in buckwheat plants.’
- ‘Another common problem with cedar, redwood and certain other species is a natural resin in the wood called tannin.’
- ‘Our perception of sweetness can be affected by a number of other factors, such as temperature, tannin and carbon dioxide, not to mention alcohol.’
- ‘The immature grain of these hybrids is high in tannin and quite bitter.’
- ‘The caffeine and tannins in tea, coffee and colas are also dehydrating agents, so don't drink more than a two cups a day.’
- ‘To counteract intestinal discharges probably caused by the calomel, surgeons administered tannin, sulphuric acid, or morphia.’
- ‘The tannin extracted from the bark and wood was important in the leather industry.’
- ‘In juvenile plants, the relative amount of tannin increased in March, decreased in April and July, and increased again in October.’
- ‘Honeysuckle imparts a raw sweetness with hints of tannin.’
- ‘This was destined to become part of the thick liquor in the tanning pits for leather, as Oak trees in particular have high levels of tannin in the bark.’
- ‘It must be eaten ripe, since latex and tannin present in the unripe fruit give it an unpleasantly astringent taste.’
- ‘Rooibos tea contains no caffeine and is very low in tannin.’
- ‘Chipped chestnut wood and bark also were used as a source of tannin for the leather industry.’
- ‘The two streams are known as blackwater creeks because tannin, released from the breakdown of leaves in the woods, darkens their waters.’
- ‘This was because tannin, a chemical that gives tea and coffee a bitter taste, binds to certain ceramic and metal materials.’
- ‘In contrast, caffeine binds with phenols and tannins, thus neutralizing these effects.’
- ‘If leeching tannin is the problem, a good sealer is the answer.’
Early 19th century: from French tanin, from tan ‘tanbark’ (ultimately related to tan) + -in.
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