Lewis Short
(adjective) : trīcēnārĭus, a, um, triceni
* Of or containing thirty: fistula,thirty quarterdigits in diameter,Front. Aquaed. 29; 48: filius,thirty years old,Sen. Excerpt. Controv. 3, 3 fin.: homo,Arn. 2, 58; Pall. Aug. 12; Front. Aquaed. 29; 48.
Charlton T. Lewis, Charles Short, A Latin Dictionary