Restringent definitions Webster's 1828 Dictionary RESTRIN'GENT, a. Astringent; styptic ... operates as an astringent or styptic. Webster's 1913 Dictionary Restringent Re*strin"gent, a. [L. restringens, p. pr.: cf. F. restringent.] Restringing; astringent; styptic. [Obs.] -- n. A restringent medicine. [Obs.] --Harvey.