Lewis Short
auctrix (noun F) : auctor.
* She that originates a thing, an author (very rare, and post-class. for auctor, q. v. fin.): materia auctrix universitatis,Tert. adv. Herm. 5: anima auctrix operum carnis,id. adv. Marc. 5, 10: comoediae scelerum et libidinum auctrices,id. Spect. 18.
* A female seller or surety (very rare, and post-class.), Cod. Diocl. et Max. 8, 45, 16; Tert. Anim. 57.
Charlton T. Lewis, Charles Short, A Latin Dictionary