Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
echoic is an adjective meaning "(of words) formed in imitation of a natural sound". It carries 2 recorded senses.
(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”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for echoic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.