Astringent
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An astringent substance is a chemical substance that tends to shrink or constrict body tissues, usually locally after topical medicinal application. The word "astringent" derives from Latin astringere, meaning "to bind fast". Two common examples are calamine lotion and witch hazel. Astringency is also the dry, puckery sensation caused by tannin in some wines and teas. The tannins denature the salivary proteins, causing a rough "sandpapery" mouthfeel. A small amount of astringency is expected in some wines, especially young red wines made from powerful varieties such as cabernet sauvignon.
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