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The Collaborative International Dictionary
Tropidorhynchus sordidus

leatherneck \leath"er*neck`\, n.

  1. (Zo["o]l.) The sordid friar bird of Australia ( Tropidorhynchus sordidus).

  2. [from the leather collar that was once part of their uniform.] A member of the United States Marine Corps; a United States Marine. [slang]