1. (Science: zoology) Any large, rapacious bird of the falcon family, especially. Of the genera aquila and Haliaeetus. The eagle is remarkable for strength, size, graceful figure, keenness of vision, and extraordinary flight. The most noted species are the golden eagle (aquila chrysaetus); the imperial eagle of Europe (a. Mogilnik or imperialis); the American bald eagle (Haliaeetus leucocephalus); the European sea eagle (H. Albicilla); and the great harpy eagle (Thrasaetus harpyia). The figure of the eagle, as the king of birds, is commonly used as an heraldic emblem, and also for standards and emblematic devices. See bald eagle, harpy, and golden eagle.
Some modern nations, as the united states, and France under the Bonapartes, have adopted the eagle as their national emblem. Russia, Austria, and Prussia have for an emblem a double-headed eagle. Bald eagle. See bald eagle. Bold eagle. See Bold. Double eagle, a gold coin of the united states worth twenty dollars.