Astringent

1. Medicine Tending to draw together or constrict tissues; styptic.
2. Sharp and penetrating; pungent or severe: astringent remarks.
n.
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.

1. severe; harsh
2. sharp or invigorating
3. (Medicine) causing contraction of body tissues, checking blood flow, or restricting secretions of fluids; styptic
n
(Medicine / Pharmacology) an astringent drug or lotion
[from Latin astringēns drawing together; see astrict]
astringency , astringence n
astringently adv

Source

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