noun

1. a small, light motorboat with hydrofoils or with a flat bottom rising in steps to the stern so that it can skim along the water's surface at high speeds
2. seaplane
3. an attachment for an airplane that enables it to glide along on the water
4. a horizontal rudder used to submerge or raise a submarine

Etymology: hydro- + plane

intransitive verb hydroplaned -·planed′, hydroplaning -·plan′·ing

1. to drive or ride in a hydroplane
2. to skim along on a film of liquid without touching the surface beneath, as vehicle tires on a wet road