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sol·i·dus | \ ˈsä-lə-dəs 
\
\ plural solidi\ ˈsä-lə-ˌdī , -ˌdē \
, -ˌdē \Definition of solidus
1 : an ancient Roman gold coin introduced by Constantine (4th century) and used to the fall of the Byzantine Empire (15th century)
2
[Medieval Latin, shilling, from Late Latin; from its use as a symbol for shillings] : slash sense 4
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The first known use of solidus was in the 14th century
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