Origin: Greek prefix anti-
Antioxidant has 3 different meanings across 1 category:
substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides
"Adding berries to my smoothie boosts its antioxidant content, which helps protect the fruit from spoiling too quickly when exposed to air."
Any substance that acts to slow or prevent the oxidation of another chemical.
"Adding green tea to her smoothie was a smart move since it is packed with an antioxidant that slows down the oxidation of the other ingredients."
Acting or having agents that act against oxidation.
"Adding blueberries to my morning smoothie boosts its antioxidant content, helping to protect those fruits from spoiling due to oxidation."