mŏdĕrātrix — Lewis & Short
mŏdĕrātrix, īcis, f.moderator.
I She who moderates or allays; a directress, mistress, governess (mostly Ciceron.):
sibi,Plaut. Cist. 2, 2, 3.—
II That which rules, guides, controls, etc.:
temperantia est moderatrix omnium commotionum,Cic. Tusc. 5, 14, 42:
materiae,id. N. D. 3, 39, 92:
factorum,id. Phil. 5, 18, 50:
officii,id. Fl. 24, 57.