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1. An aeroplane that can land on or take off from water
   "the designer of marine aircraft demonstrated his newest hydroplane";
   - seaplane
    
2. 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";
   - hydrofoil

1. Glide on the water in a hydroplane
   - seaplane

Derived forms: hydroplaned, hydroplanes, hydroplaning

Type of: aeroplane [Brit], airplane [N. Amer], aviate, fly, pilot, plane, speedboat

Encyclopedia: Hydroplane