say it: an-tee-AHK-suh-duhnt
antioxidant is a noun meaning "substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides". It is pronounced /ˌæntiˈɑksədənt/ — an-tee-AHK-suh-duhnt. It carries one recorded sense.
substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for antioxidant come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.