† aceˈtosous,a.Obs. [f. L. acētōs-us + -ous.] An early by-form of acetose, acetous. 1605Timme Quersitanus iii. 189 Fermentation..consisteth in a certaine acetosus liquor of nature.1612Woodall Surgeon's MateWks. 1653, 174 Rather use Acetosous medicines.