\A*ce"tous\ (#; 277), a. [L. acetum vinegar, fr. acere
to be sour.]
1. Having a sour taste; sour; acid. ``An acetous spirit.''
   --Boyle. ``A liquid of an acetous kind.'' --Bp. Lowth.
2. Causing, or connected with, acetification; as, acetous
   fermentation.
{Acetous acid}, a name formerly given to vinegar