shellback 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.
- an old, experienced sailor
- anyone who has crossed the equator by ship
Origin: shell plush back, in allusion to the shell of the sea turtle
shellback definition by American Heritage Dictionary
- A sailor who has crossed the equator.
- A veteran sailor.
Origin: From the toughness of such a sailor.