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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.
lighter-than-air is an adjective meaning "relating to a balloon or other aircraft that flies because it weighs less than the air it displaces". It carries one recorded sense.
relating to a balloon or other aircraft that flies because it weighs less than the air it displaces
aircraft
Definitions, synonyms and semantic relations for lighter-than-air come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.