1. imperatrix - Noun
2. Imperatrix - Proper noun
imperatrix (plural imperatrices)
(historical or archaic) female equivalent of imperator; empress
Imperatrix
(formal, usually italicized) The reigning empress; female equivalent of Imperator
He reportedly entertained the other passengers with "Ave Imperatrix!, A Poem on England", about the rise and fall of empires. Source: Internet