machinatrix

Etymology
Borrowed from ; equivalent to.

Noun

 * 1) A woman who machinates; a schemer, plotter.
 * 2) * 1902, Watson Bradshaw, "Medea", Act II., in The Ten Tragedies of Seneca, page 421.
 * No; thou! thou art the sole machinatrix of all these terrible crimes, thou whose wickedness as a woman is supplemented with that masculine strength which has endowed thee with the audacity to perpetrate such deeds