Acescent

from The Collaborative International Dictionary of English v.0.48

Acescent \A*ces"cent\, a. [L. acescens, -entis, p. pr. of
   acescere to turn sour; inchoative of acere to be sour: cf. F.
   acescent. See {Acid}.]
   Turning sour; readily becoming tart or acid; slightly sour.
   --Faraday.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Acescent \A*ces"cent\, n.
   A substance liable to become sour.
   [1913 Webster]