"hydroplanes" in the noun sense
1. seaplane, hydroplane
an airplane that can land on or take off from water
"the designer of marine aircraft demonstrated his newest hydroplane"
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"
"hydroplanes" in the verb sense
1. hydroplane, seaplane
glide on the water in a hydroplane
Source: WordNet® (An amazing lexical database of English)
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