avoirdupois

Etymology
From, , , , , from +  + , influenced by  +  + ; compare 🇨🇬.

Noun

 * 1)  The official system of weights used in the UK between 1856 and 1963. It had been the customary system in London since 1300.
 * 2)  The official system of weights used in the USA between 1866 and 1959.
 * 3)  Weight; heaviness.