Having the quality of constringing; tending to bind, compress, or constrict; astringent.
From constringe plus the adjective suffix -ent, meaning 'tending to' or 'having the property of.' It's related to astringent but more archaic.
Tannic acids in red wine are constringent substances—they literally bind to proteins in your mouth and make your saliva thick and dry, which is why wine tasting involves specific terminology about 'mouth feel.'
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