Lewis Short
(adjective) : sēdĕcim (also written sexdĕcim), sex-decem
* Sixteen, Plaut. Rud. 5, 3, 66; Ter. Eun. 3, 3, 20; 4, 4, 26; Caes. B. G. 1, 8; Liv. 33, 3; 37, 40; Plin. 10, 33, 51, § 103 al.: sexdecim,Liv. 33, 30; Col. 2, 10 fin.; Nep. Att. 16, 3 (separately, decem et sex, Liv. 10, 31, 7; 37, 40 init.).
Charlton T. Lewis, Charles Short, A Latin Dictionary