secus (1) n indecl.
2 SAC-, a sex .—Only acc sing. adverb. : liberorum capitum virile secus ad decem milia capta, males , L.: muliebre, L., Ta.
sĕcus, n. indecl., v. sexus. ...
A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.