"hydrofoil" in the noun sense
1. hydrofoil, foil
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
"the fins of a fish act as hydrofoils"
2. hydrofoil, hydroplane
a speedboat that is equipped with winglike structures that lift it so that it skims the water at high speeds
"the museum houses a replica of the jet hydroplane that broke the record"
Source: WordNet® (An amazing lexical database of English)
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