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au·re·us | \ ˈȯr-ē-əs 
\
\ plural aurei\ ˈȯr-ē-ˌī \
Definition of aureus
: a gold coin of ancient Rome varying in weight from ¹/₃₀ to ¹/₇₀ libra
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Time Traveler for aureus
The first known use of aureus was in 1609
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