Pronunciation: (tri-mis'is), [key]
—pl. -mis•sesPronunciation: (-mis'ēz). [key]
1. Also called triens. a gold coin of the Eastern Roman Empire, the third part of a solidus, first issued in the 3rd century a.d.
2. a Merovingian gold coin imitating this.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.