praeceptrix, īcis, f. [praeceptor],
a preceptress (class.): sapientiā praeceptrice, Cic. Fin. 1, 13, 43: praeceptrix et magistra, Vitr. 10, 1.
praeceptrīx īcis, f praeceptor, a preceptress : quā (sapientiā) praeceptrice. ...
An Elementary Latin Dictionary