The Collaborative International Dictionary of English v.0.48:

Zymology \Zy*mol"o*gy\, n. [Zyme + -logy: cf. F. zymologie.]
   A treatise on the fermentation of liquors, or the doctrine of
   fermentation. [Written also zumology.]
   [1913 Webster]

WordNet (r) 3.0 (2006):

zymology
    n 1: the branch of chemistry concerned with fermentation (as in
         making wine or brewing or distilling) [syn: zymology,
         zymurgy]