Smith's Bible Dictionary
Vinegar. The Hebrew word translated "vinegar" was applied to a beverage consisting generally of wine or strong drink turned sour, but sometimes artificially made by an admixture of barley and wine, and thus liable to fermentation. It was acid even to a proverb, Proverbs 10:26, and by itself formed an unpleasant draught, Psalms 49:21, but was used by laborers. Ruth 2:14. Similar was the acetum of the Romans - a thin, sour wine, consumed by soldiers. This was the beverage of which the Saviour partook in his dying moments. Matthew 27:48; Mark 15:36; John 19:29-30.
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Smith, William, Dr. Entry for 'Vinegar'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/v/vinegar.html. 1901.