Source : Webster's Revised Unabridged Dictionary (1913)

Acetify \A*cet"i*fy\, v. t. [imp. & p. p. {Acetified}; p. pr. &
   vb. n. {Acetifying}.] [L. acetum vinegar + -fly.]
   To convert into acid or vinegar.

Acetify \A*cet"i*fy\, v. i.
   To turn acid. --Encyc. Dom. Econ.

Source : WordNet®

acetify
     v 1: make sour or more sour [syn: {sour}, {acidify}, {acidulate}]
          [ant: {sweeten}]
     2: turn acidic; "the solution acetified" [syn: {acidify}] [ant:
         {alkalize}]
     [also: {acetified}]