Definition of "wey"

Than though I hadde this wouke ywonne a weye of Essex cheese.

c. 1376, William Langland, The Vision of Piers Plowman, Version B, Passus 5, Line 91

Seven pounds make a clove, 2 cloves a stone, 2 stone a tod, 6½ tods a wey, 2 weys a sack, 12 sacks a last. […] It is to be observed here that a sack is 13 tods, and a tod 28 pounds, so that the sack is 364 pounds.

1843, The Penny Cyclopaedia of the Society for the Diffusion of Useful Knowledge‎, volume 27, page 202

Cheese and salt are purchased by the wey of two hundredweight, or by the stone of fourteen pounds.

1882, James Edwin Thorold Rogers, A History of Agriculture and Prices in England, volume 4, page 208

WEY, WEIGH, an English measure of weight; for wool, equal to 6½ tods of 28 lbs.; a load or five quarters of wheat; 40 bushels of salt, each 56 lbs.; 32 cloves of cheese, each 7 lbs.; 48 bushels of oats and barley; 2 to 3 cwt. of butter.

1858, Peter Lund Simmonds, The Dictionary of Trade Products, Manufacturing, and Technical Terms‎, page 410