means “London weight.” London used to be called Troy-novant. (See above.) The general notion that the word is from Troyes, a town of France, and that the weight was brought to Europe from Grand
Cairo by crusaders, is wholly untenable, as the term Troy Weight was
used in England in the reign of Edward the Confessor. Troy weight is
old London weight, and Avoirdupois the weight brought over by the
Normans. (See Avoirdupois.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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