: a substance (such as beta-carotene or vitamin C) that inhibits oxidation or reactions promoted by oxygen, peroxides, or free radicals
:not containing caffeine especially by having the caffeine removed : decaffeinatedcaffeine-free coffee/soda
:(of food or a diet) not containing gluten.
The Food and Drug Administration issued a final rule to define the term “gluten-free” for voluntary use in the labeling of foods. One of the criteria for the final rule defines the term “gluten-free” to mean that the food bearing the claim does not contain an ingredient that is a gluten-containing grain (e.g., spelt wheat);
: a substance and especially a carbohydrate (such as inulin) that is nearly or wholly indigestible and that when consumed (as in food) promotes the growth of beneficial bacteria in the digestive tract