What does acescent mean?
The definition of acescent
A*ces”cent, a.
Etym: [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.

A*ces”cent, n.
A substance liable to become sour.