Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
antitumor is an adjective meaning "used in the treatment of cancer". It carries one recorded sense.
used in the treatment of cancer
“anticancer drug”
“an antineoplastic effect”
Definitions, synonyms and semantic relations for antitumor come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.