say it: HEL-i-kahp-tur
helicopter is a noun meaning "an aircraft without wings that obtains its lift from the rotation of overhead blades". It is pronounced /ˈhɛlɪˌkɑptɚ/ — HEL-i-kahp-tur. It carries one recorded sense.
an aircraft without wings that obtains its lift from the rotation of overhead blades
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 helicopter come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.