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solidus

noun sol·i·dus \ ˈsä-lə-dəs \
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Definition of solidus

plural solidi play \ˈsä-lə-ˌdī, -ˌdē\
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 4

Origin and Etymology of solidus

Middle English, from Late Latin, from Latin, solid

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