hydroplane

hydroplane is a   Noun

Definition:

[1] A plane, or any of a number of planes, projecting from the hull of a submarine boat, which by being elevated or depressed cause the boat, when going ahead, to sink or rise, after the manner of an aëroplane.

[2] A projecting plane or fin on a gliding boat to lift the moving boat on top of the water; also, a gliding boat.

Synonyms: