Lewis Short
(adjective) : octōnārĭus, a, um, octoni
* Consisting of eight: numerus,Varr. L. L. 9, § 86 Müll.: versus,an Iambic verse of eight feet,Quint. 9, 4, 72; Diom. p. 514 P.: fistula,the plate for which was eight inches broad,Front. Aquaed. 28; 42; Plin. 31, 6, 31, § 58.
Charlton T. Lewis, Charles Short, A Latin Dictionary