GNU Collaborative International Dictionary of English

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1.       
   Sou , n.; pl. Sous  or . [F. sou, OF. sol, from L. solidus a gold coin, in LL., a coin of less value. See Sold, n., Solid, and and cf. Sol, Soldo.] An old French copper coin, equivalent in value to, and now displaced by, the five-centime piece (¹⁄₂₀ of a franc), which is popularly called a sou.
   1913 Webster