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.