Base coin. The word originated from one of the billon coins struck in the reign of Queen Mary, which bore the words Reg. Maria as part of the legend.
⁂ Billon is mixed metal for coinage, especially silver largely alloyed with copper.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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