aureus

[awr-ee-uhs]
noun, plural aurei [awr-ee-ahy] .
a gold coin and monetary unit of ancient Rome, from Caesar to Constantine I.

Origin:
1600–10; < Latin: literally, golden

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aureus (ˈɔːrɪəs)
 
n , pl aurei
a gold coin of the Roman Empire
 
[Latin: golden; see aureate]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Encyclopedia Britannica
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aureus

basic gold monetary unit of ancient Rome and the Roman world. It was first named nummus aureus ("gold money"), or denarius aureus, and was equal to 25 silver denarii; a denarius equaled 10 bronze asses. (In 89 BC, the sestertius, equal to one-quarter of a denarius, replaced the bronze ass as a unit of account.) In Constantine's reform of AD 312, the aureus was replaced by the solidus as the basic monetary unit

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Other health threats, such as antibiotic-resistant strains of staphylococcus aureus, have emerged from pig farms as well.
Most carbuncles are caused by the bacteria staphylococcus aureus.
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