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