dŏmĭnātrix, īcis, f. [dominator],
a female ruler , mistress (very rare): caeca ac temeraria dominatrix animi cupiditas, * Cic. Inv. 1, 2, 2: freti (Creta), Sen. Hippol. 85; Vulg. Jerem. 13, 18.
dominātrīx īcis, f dominator, a female ruler, mistress : animi cupiditas. ...
An Elementary Latin Dictionary