D defs.my
Entry 1 sense Webster, 1913

Emperor

/ĕm'-pẽr-ẽr/ · Em·per·or · IPA /ˈɛmpəɹɚ/
01 n. The sovereign or supreme monarch of an empire; -- a title of dignity superior to that of king; as, the emperor of Germany or of Austria; th…
  1. 1.
    The sovereign or supreme monarch of an empire; -- a title of dignity superior to that of king; as, the emperor of Germany or of Austria; the emperor or Czar of Russia.
Phrases & compounds
Emperor goose — a large and handsome goose (Philacte canagica), found in Alaska.
Emperor moth — one of several large and beautiful bombycid moths, with transparent spots on the wings; as the American Cecropia moth (Platysamia cecropia), and the European species (Saturnia pavonia).
Emperor paper — See under Paper.
Purple emperor — a large, strong British butterfly (Apatura iris).