Lewis & Short

bĭlībris, e [bilibra], of two pounds.

  1. I. Adj.
    1. A. Weighing two pounds: offae, Plin. 18, 11, 26, § 103: mullus, Mart. 3, 45, 5.
    2. B. Containing two pounds: aqualis, * Plaut. Mil. 3, 2, 39: cornu, Hor. S. 2, 2, 61.
  2. II. Subst., a quantity of two pounds, Veg. Vet. 3, 6, 6; 3, 6, 10; Vulg. Apoc. 6, 6.