Hydroplane \Hy"dro*plane\, n. [Pref. hydro-, 1 + plane.]
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 a["e]roplane.
2. A projecting plane or fin on a gliding boat to lift the
moving boat on top of the water; also, a gliding boat.
Source: Webster's Revised Unabridged Dictionary (1913)
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