How do you spell Astriction

Available Definitions:
1)  n. - The act of binding; restriction; also, obligation.
2)  n. - A contraction of parts by applications; the action of an astringent substance on the animal economy.
3)  n. - Constipation.
4)  n. - Astringency.
5)  n. - An obligation to have the grain growing on certain lands ground at a certain mill, the owner paying a toll.