noun, verb, -planed, -plan⋅ing.| 1. | a seaplane. |
| 2. | an attachment to an airplane enabling it to glide on the water. |
| 3. | a light, high-powered boat, esp. one with hydrofoils or a stepped bottom, designed to plane along the surface of the water at very high speeds. |
| 4. | a horizontal rudder for submerging or elevating a submarine. |
| 5. | to skim over water in the manner of a hydroplane. |
| 6. | to travel in a hydroplane. |
| 7. | Also, aquaplane. (of a vehicular tire or vehicle) to ride on a film of water on a wet surface with a resulting decrease in braking and steering effectiveness. |
hy·dro·plane (hī'drə-plān') n.
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