The unit of weight (Latin, pondus, weight); also cash to
the value of twenty shillings sterling, because in the Carlovingian
period the Roman pound (twelve ounces) of pure silver was coined into
240 silver pennies. The
symbols and lb. are for libra, the Latin for a pound.
(See Penny for Pound.)
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
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