Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
uncontaminating is an adjective meaning "not spreading pollution or contamination; especially radioactive contamination". It carries one recorded sense.
not spreading pollution or contamination; especially radioactive contamination
“a clean fuel”
“cleaner and more efficient engines”
“the tactical bomb is reasonably clean”
Definitions, synonyms and semantic relations for uncontaminating come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.