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From Biology-Online Dictionary | Biology-Online Dictionary
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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.

(Science: zoology) emperor goose, a large, strong British butterfly (Apatura iris).

Origin: OF. Empereor, empereour, f. Empereur, L. Imperator, fr. Imperare to command; in in _ parare to prepare, order. See parade, and cf. Imperative, empress.