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WordNet-Online
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Noun hydroplane has 2 senses
- seaplane, hydroplane - an airplane that can land on or take off from water; "the designer of marine aircraft demonstrated his newest hydroplane"
--1 is a kind of airplane, aeroplane, plane
--1 has particulars: floatplane, pontoon plane; flying boat
- hydrofoil, hydroplane - a speedboat that is equipped with hydrofoils 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"
--2 is a kind of speedboat
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