Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
onomatopoeical is an adjective meaning "(of words) formed in imitation of a natural sound". It carries one recorded sense.
(of words) formed in imitation of a natural sound
“onomatopoeic words are imitative of noises”
“it was independently developed in more than one place as an onomatopoetic term”
Definitions, synonyms and semantic relations for onomatopoeical come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.