Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unmyelinated is an adjective meaning "(of neurons) not myelinated". It carries one recorded sense.
(of neurons) not myelinated
Definitions, synonyms and semantic relations for unmyelinated come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.