The term 'OLD LIQUID MEASURE' can be broken down into two crossword solutions: DRACHM (6 letters) and TIERCE (6 letters). A drachm is an ancient unit of measurement for liquids, equal to 1/8 of an ounce. It was used in many parts of the world, including Greece, Rome, and the Middle East. A tierce is a unit of liquid measurement that was used in Europe during the Middle Ages. It is equal to 42 gallons, or about one-third of a barrel. Both of these units of measurement are no longer used today.