Source : Webster's Revised Unabridged Dictionary (1913)

Astringency \As*trin"gen*cy\ ([a^]s*tr[i^]n"jen*s[y^]), n.
   The quality of being astringent; the power of contracting the
   parts of the body; that quality in medicines or other
   substances which causes contraction of the organic textures;
   as, the astringency of tannin.

Source : WordNet®

astringency
     n 1: a sharp astringent taste; the taste experience when a
          substance causes the mouth to pucker [syn: {astringence}]
     2: the ability to contract or draw together soft body tissues
        to check blood flow or restrict secretion of fluids [syn:
        {stypsis}]