hydrofoils

'hydrofoils'

[hydrofoil.n.01] as in: a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through

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Examples:
the fins of a fish act as hydrofoils

'hydrofoils'

[hydrofoil.n.02] as in: a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds

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Examples:
the museum houses a replica of the jet hydroplane that broke the record