Triens
Black's Law Dictionary · Henry Campbell Black, M.A. · 1910
Black's Law Dictionary
Lat. In Roman law. A subdivision of the os, containing four unciæ; the proportion of four-twelfths or one-third.
2 Bl. Comm. 462, note m.
A copper coin of the value of one-third of the os.
Brande.
In feudal law. Dower or third.
2 BI. Comm. 129.