leatherneck definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
☆ Slang a U.S. Marine
Origin: from the leather lining that was part of the collar of the Marine uniform
leatherneck definition by American Heritage Dictionary
A member of the U.S. Marine Corps.
Origin: From the leather neckband that was once part of the uniform.