Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
atonic is an adjective meaning "characterized by a lack of tonus". It carries 2 recorded senses.
characterized by a lack of tonus
(used of syllables) carrying no stress
“an atonic syllable carries no stress”
Definitions, synonyms and semantic relations for atonic come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.