Astriction

As·tric·tion

Astriction

n.
  1. The act of binding; restriction; also, obligation.
  2. A contraction of parts by applications; the action of an astringent substance on the animal economy. (Med.)
  3. Astringency. [Obs.]
  4. An obligation to have the grain growing on certain lands ground at a certain mill, the owner paying a toll. (Scots Law)