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