Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
hyperfine is an adjective meaning "extremely fine or thin, as in a spectral line split into two or more components". It carries one recorded sense.
extremely fine or thin, as in a spectral line split into two or more components
“hyperfine structure”
physics
Definitions, synonyms and semantic relations for hyperfine come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.