ˈhɑe.dɹəˌfoɪl ˈhaɪ.dɹoʊˌfɔɪl ˈhaɪdɹəʊˌpleɪn ˈhaɪdɹoʊˌpleɪn ˈhaɪdɹəʊˌpleɪn ˈhaɪdɹoʊˌpleɪn glide on the water in a hydroplane a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds the museum houses a replica of the jet hydroplane that broke the record an airplane that can land on or take off from water the designer of marine aircraft demonstrated his newest hydroplane