Definitions of hydroplane:

• noun:   a speedboat that is equipped with hydrofoils that lift it so that it skims the water at high speeds

  Example: "The museum houses a replica of the jet hydroplane that broke the record"

• noun:   an airplane that can land on or take off from water

  Example: "The designer of marine aircraft demonstrated his newest hydroplane"

• verb:   glide on the water in a hydroplane