dictatrix

noun2

1. •
   A female dictator.

   • Our principal domestic, in dignity and station, was Mrs Primmins, who was waiting gentlewoman, housekeeper, and tyrannical dictatrix of the whole establishment. — 1849
2. •
   (no longer used) A dictatorial entity personified as female; that which dictates.

   • the Church of Rome which is the great dictatrix of dogmaticall resolutions, and the declarer of Heresy — 1648