ETYM Old Fren. empereor, empereour, French empereur, Latin imperator, from imperare to command; in in + parare to prepare, order. Related to Parade, Imperative, Empress.
1. Large moth of temperate forests of Eurasia having heavily scaled transparent wings; SYN. emperor moth, Saturnia pavonia.
2. Red table grape of California.
3. The male ruler of an empire.