Lewis Short
(adjective) : sŭper-tertĭus, a, um, ; of a number
* One third as much more (i.e. that bears to another the ratio of 4 to 3): numerus, a transl. of the Gr. ἐπίτριτον, Censor. de Die Nat. 10, 8; 10, 11; Mart. Cap. 7, § 761 sq.
Charlton T. Lewis, Charles Short, A Latin Dictionary