I. hy ‧ dro ‧ plane 1 /ˈhaɪdrəpleɪn/ BrE AmE noun [countable]
1 . a ↑ hydrofoil
2 . American English a plane that can take off from and land on water
II. hydroplane 2 BrE AmE verb [intransitive]
1 . American English if a car hydroplanes, it slides on a wet road in a way that is out of control SYN aquaplane British English
2 . if a boat hydroplanes, it travels very quickly, just touching the surface of the water