Lewis Short
(adjective) : ternārĭus, a, um, terni
* Containing or consisting of three, ternary.
* Adj.: scrobes,i. e. of three feet,Col. 11, 2, 28: numerus,Aus. Idyll. 11 praef.
* Subst.: ternārĭus, ii, m., for triens, a third of an as, Pelag. Vet. 16.
Charlton T. Lewis, Charles Short, A Latin Dictionary