Triens

noun

1. A copper coin of the ancient Roman republic, the third part of the as; also, a gold coin of the Roman empire, the third part of the solidus. See as and solidus.
2. In law, a third part; also, dower.
3. A Roman copper coin, equal to one third of the as. See 3d as, 2.
4. A bronze coin minted during the Roman Republic valued at 4 unciae.