A man riding a Jet Ski.
Jet Ski 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.
trademark for a watercraft built like a motorcycle that is propelled by a jet of water
any such watercraft
Jet Ski definition by American Heritage Dictionary
A trademark used for a personal watercraft.