Obolus, óboli, pen. cor. Terent.A weight containing three carrets that is halfe a scruple. It is also a coyne, but variable according to the countrey: with vs it is an halfe penny.Obolus terræ.Fiue foote in breadth and ten in length, that is fiftie foote square.Obolus.Among the Athenians contained 8. Chalcos, that is 4. Quadrantes, and as some thinke was in value somewhat less then out halfepennie, but I thinke a little more. For Drachma contayned 6. Obolos, and Denarius being of the same value, contained 4. Sestertios, euerie Sestertius being in value a erling pennie when eight grotes made an ounce.
Lewis and Short: Latin dictionary
ŏbŏlus, i, m., = o)bolo/s. I.Lit., an obol, a small Greek coin, the sixth part of a drachm, equivalent to three and a half cents Federal currency, Vitr. 3, 1: siclus viginti obolos habet, Vulg. Exod. 30, 13.— II.Transf., as a weight, the sixth part of a drachm Fann. de Ponder. et Mens. 37; cf. Cels. 5, 17; Plin. 21, 34, 109, 185; 25, 12, 91, 142: trium obolorum pondere, id. 21, 25, 96, 169.