selibra

sē-libra (e short, Mart. 4, 46, 7; 10, 57, 1), ae, f. [semi],

a half-pound , Cato R. R. 84, 1; Varr. L. L. 5, § 171 Müll.; Col. 12, 5; Liv. 5, 47; Plin. 14, 16, 19, § 108; Mart. l.l.