a horse-load; a load or burden; specifically, eight bushels of grain; three hundred-weight of hay or manure; two hundred-weight of straw (a cartload).
Examples: seam of apples (9 pecks); of corn (a quarter); of dung; of glass (120 lb.); of grain (8 bushels); of hay (3 ctw); of lime; of manure, (3 cwt); of oats (8 bushels); of sand (6-8 pecks); of straw (3 cwt); of wood.