The Collaborative International Dictionary of English v.0.48:
Astriction \As*tric"tion\, n. [L. astrictio.]
1. The act of binding; restriction; also, obligation.
(a) A contraction of parts by applications; the action of
an astringent substance on the animal economy.
(b) Constipation. --Arbuthnot.
3. Astringency. [Obs.] --Bacon.
4. (Scots Law) An obligation to have the grain growing on
certain lands ground at a certain mill, the owner paying a
Note: The lands were said to be astricted to the mill.