jet skiTranslate jet ski | into German | into Italian Definition of jet ski noun trademark a small jet-propelled vehicle which skims across the surface of water and is ridden in a similar way to a motorcycle. verb (jet-ski) [no object] ride on a jet-ski: jet-skiing is limited to specified areas of the coastDerivatives jet-skier noun jet-skiing noun jet ski in other Oxford dictionaries Definition of jet ski in the US English dictionary