Meaning of astringent

as•trin•gent

1. contracting; constrictive; styptic.
2. harshly biting; caustic: his astringent criticism.
3. stern or severe; austere.
4. sharply incisive; pungent: astringent wit.

1. a substance that contracts the tissues or canals of the body, thereby diminishing discharges, as of mucus or blood.
2. a cosmetic that cleans the skin and constricts the pores.