from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A gold coin minted during the Roman Empire from approximately 100 B.C. to 309 A.D., equal to 25 denarii.
from The Century Dictionary and Cyclopedia
- n. A Roman gold coin equivalent to 100 sesterces or 25 denarii, first minted in the first century b. c., and issued under the empire till the reign of Constantine I., who substituted for it the gold solidus.
From Latin aureus ("golden; gold coin equivalent to 25 denarii"), noun use of adjective, from aurum ("gold"). (Wiktionary)