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.
mind-altering is an adjective meaning "producing mood changes or distorted perception". It carries one recorded sense.
producing mood changes or distorted perception
“hallucinogenic drugs are mind-altering substances”
Definitions, synonyms and semantic relations for mind-altering come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .