Early 16th century; earliest use found in The Grete Herball. From classical Latin acētum vinegar, use as noun of neuter of past participle of acēre to be sour.
Definition of acetum in US English:
acetum
noun
Vinegar. Now historical.
Origin
Early 16th century; earliest use found in The Grete Herball. From classical Latin acētum vinegar, use as noun of neuter of past participle of acēre to be sour.