waterski Syllabification: (wa·ter·ski)Pronunciation: /ˈwôtərˌskē, ˈwä-/Translate waterski | into German Definition of waterski noun (plural waterskis) each of a pair of skis enabling the wearer to skim the surface of the water when towed by a motorboat. verb [no object] skim the surface of water on waterskis. Derivatives waterskier noun waterski in other Oxford dictionaries Definition of waterski in the British & World English dictionary