hydroplane (Noun) — An aeroplane that can land on or take off from water. ex. "the designer of marine aircraft demonstrated his newest hydroplane"
hydroplane (Noun) — A speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds. ex. "the museum houses a replica of the jet hydroplane that broke the record"
hydroplane (Verb) — Glide on the water in a hydroplane.