astriction (n.) Look up astriction at Dictionary.com
"act of binding close or constricting," especially contraction by applications, 1560s, from Latin astrictionem (nominative astrictio), noun of action from past participle stem of astringere "to bind fast, tighten, contract," from assimilated form of ad "to" (see ad-) + stringere "draw tight" (see strain (v.)). Related: Astrictive (1550s). As verbs, astrict is from 1510s; astringe from 1520s.