ounce avoirdupois ( synonym found)
Definition of ounce avoirdupois:

°the official system of weights used in UK between 1856 and 1963. It had been the customary system in London since AD 1300.
°the official system of weights used in USA between 1866 and 1959.
Definition of ounce avoirdupois:

°the official system of weights used in UK between 1856 and 1963. It had been the customary system in London since AD 1300.
°the official system of weights used in USA between 1866 and 1959.
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