Something or someone that astringes; a substance or agent that causes contraction or constriction.
Formed from astringe (verb) with the agent suffix -er, creating a noun for something that performs the astringent action. This follows standard English word formation patterns.
While 'astringer' is rarely used in modern English, historical apothecaries would have called powerful astringents 'strong astringers'—the word captures the active, dynamic nature of these chemical agents.
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