noun. Vinegar.

noun. An acetic acid solution of a drug.

noun. A pharmaceutical preparation usually made by percolating a drug with dilute acetic acid.

noun. Vinegar (which see).

noun. a dilute solution of acetic acid that is used as a solvent (e.g. for a drug)

noun. sour-tasting liquid produced usually by oxidation of the alcohol in wine or cider and used as a condiment or food preservative

"When used in the Liturgy the hymn is often broken into smaller hymns such as: Lustra sex qui iam peregit, En acetum, fel, arundo, and Crux fidelis inter omnes."

acetic acid  ethanoic acid