the world > relative properties > measurement > measurement by weighing > [noun] > unit or denomination of weight > units for lead or lead ore (4)
A unit of weight equal to a thirtieth of a fother or load, typically used for measuring lead. Now historical.
spec. A definite weight of some specified substance. Of lead: Now usually 19½ cwt.
spec. A heap of metallic ore, of alum; a definite quantity (8 cwt.) of lead ore.