Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
non-buoyant is an adjective meaning "tending to sink in a liquid or fall in air". It carries one recorded sense.
tending to sink in a liquid or fall in air
Definitions, synonyms and semantic relations for non-buoyant come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.