a former unit of weight or volume varying with different kinds of goods, e. Wey definition is - any of various old units of weight used locally in the British Isles. Wey definition, an old British unit of weight of various values, especially 16 stones of 16. WEY is a valid scrabble word. Wey definition: a standard measurement of weight that is specific to a particular. The word wey is NOT a Words With Friends word.