Noun has 2 senses

• hydrofoil(n = noun.artifact) 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"


• hydrofoil(n = noun.artifact) 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"