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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hydroplane is a noun and verb meaning "an airplane that can land on or take off from water". It carries 3 recorded senses.
an airplane that can land on or take off from water
“the designer of marine aircraft demonstrated his newest 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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for hydroplane come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.