Lewis Short
(Adj.Subst.) : bĭlībris, ebilibra
* Of two pounds.
* Adj.
* Weighing two pounds: offae,Plin. 18, 11, 26, § 103: mullus,Mart. 3, 45, 5.
* Subst., a quantity of two pounds, Veg. Vet. 3, 6, 6; 3, 6, 10; Vulg. Apoc. 6, 6.
Charlton T. Lewis, Charles Short, A Latin Dictionary