To remove vitamins from food or a substance, especially during processing or cooking.
From de- (removal) + vitamin + -ize. Vitamins themselves come from Latin vita (life) + amine (a chemical group), so this literally means removing life-chemicals.
When flour is 'devitaminized' by industrial processing, they later have to 'enrich' it by adding vitamins back—basically, we remove them then put them back in, which seems like it defeats the purpose.
Complete word intelligence in one call. Free tier — 50 lookups/day.