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The Collaborative International Dictionary
tetradrachm

Stater \Sta"ter\ (st[=a]"t[~e]r), n. [L. stater, Gr. stath`r.] (Gr. Antiq.) The principal gold coin of ancient Greece. It varied much in value, the stater best known at Athens being worth about [pounds]1 2s., or about $5.35 (in 1890 value). The Attic silver tetradrachm was in later times called stater.

Wiktionary
tetradrachm

n. A silver coin in Ancient Greece, equivalent to four drachms.

Wikipedia
Tetradrachm

The tetradrachm was an Ancient Greek silver coin equivalent to four drachmae. In Athens it replaced the earlier "heraldic" type of didrachms and it was in wide circulation from ca. 510 to ca. 38 BC.

Usage examples of "tetradrachm".

It is a tetradrachm, struck to commemorate the battle fought at Amphipolos, and the founding of a city on the site of the battlefield.