1. boats designed to skim over the surface of water at high speeds
2. seaplanes that can take off from and land on water

1. skims uncontrollably on a wet surface, losing traction

Examples

• The hydroplanes raced across the lake at incredible speeds.
• Several vintage hydroplanes were displayed at the aviation museum.
• The car hydroplanes on wet roads when driving too fast.
• Racing hydroplanes can reach speeds over 200 mph.
• The pilot landed the hydroplane smoothly on the calm water.
• When it rains heavily, vehicles often hydroplane on the highway.
• The hydroplanes competed in the annual regatta.
• Reduce speed to prevent your car from hydroplaning in puddles.