The reports, too, are at least as often made as ounces in the short ton of 2000 lbs., as on the more orthodox ton of 2240 lbs.
late 14c., tonne, unit for measuring the carrying capacity of a ship, originally "space occupied by a tun or cask of wine," thus identical to tun (q.v.). The two words were not differentiated until 1680s. The measure of weight is first recorded late 15c.; the spelling ton is from 1530s, and became firmly established 18c.
|short ton |