Smithfield stone
nounUS /ˈsmɪθfiːld stoʊn/ · UK /ˈsmɪθfiːld stəʊn/
Etymology Smithfield (a London meat market) + stone. Calculated on the basis that for every 14lb (1 standard stone) of livestock purchased, 8lb (1 Smithfield stone) of saleable meat are produced.
1
Obsolete A British unit of weight used in the meat trade, equal to eight pounds (avoirdupois).