Definition of magpie diver in US English:

magpie diver

noun

  • 1The smew, Mergus albellus.

  • 2The goldeneye, Bucephala clangula.

  • 3The tufted duck, Aythya fuligula.

Origin

Late 18th century; earliest use found in Philipp Nemnich (1764–1822).