Lewis & Short

† trĭōbŏlus, i, m., = τριώβολος.

  1. I. As a coin, a piece of three oboli, a half-drachm; used to denote a trifle: negare se debere tibi triobolum, a sixpence, Plaut. Bacch. 2, 3, 26: neque triobolum ullum amicae das, id. Poen. 4, 2, 46; id. Rud. 4, 3, 100; 5, 2, 43; 5, 2, 67; cf.: non ego homo trioboli sum, nisi, etc., id. Poen. 1, 2, 168.
  2. II. As a weight, half a drachm, Cato, R. R. 127, 2; Cael. Aur. Acut. 2, 9, 46.