Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
proto-oncogene is a noun meaning "a normal gene that has the potential to become an oncogene". It carries one recorded sense.
a normal gene that has the potential to become an oncogene
Definitions, synonyms and semantic relations for proto-oncogene come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.