Jet Ski
Trademark.
a brand of personal watercraft.
British Dictionary definitions for jet ski
Jet Ski
noun
trademark
a small self-propelled vehicle for one person resembling a scooter, which skims across water on a flat keel, and is steered by means of handlebars
verb jet-ski -skis, -skiing, -skied or -ski'd (intr; usually not capital)
to ride a Jet Ski