Lewis Short
sexis (noun N) : id.. *
* The number six: ut ex duobus, triplo sexis implevit,Mart. Cap. 7, § 767.—*
* Six asses: s littera i praecedente finita neutra monoptota sunt, ut tressis, sexis, Mart. Cap. 3, § 305.
Charlton T. Lewis, Charles Short, A Latin Dictionary