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1. Medicine Tending to draw together or constrict tissues; styptic.
2. Sharp and penetrating; pungent or severe: astringent remarks.
A substance or preparation, such as alum, that draws together or constricts body tissues and is effective in stopping the flow of blood or other secretions.
[Latin astringēns, astringent-, present participle of astringere, to bind fast : ad-, ad- + stringere, to bind; see streig- in Indo-European roots.]