The term trachy (Greek: τραχύ), plural trachea (τραχέα), meaning "rough" or "uneven", was used to describe the cup-shaped (incorrectly often called "scyphate") Byzantine coins struck in the 11th–14th centuries. The term was properly applied to coins of electrum, billon, or copper, and not to the gold hyperpyra.
- ODB, "Trachy" (Ph. Grierson), p. 2101.
- Kazhdan, Alexander, ed. (1991). The Oxford Dictionary of Byzantium. Oxford and New York: Oxford University Press. ISBN 978-0-19-504652-6. Missing or empty
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