Translations: Etymology: Suggested by w:Jíns Jakob Berzelius, Berzelius in a letter to w:Gerhardus Johannes Mulder, Mulder, from the "".
- (context, nutrition) One of three major classes of food or source of food energy (4 kcal/gram) abundant in animal-derived foods (ie: meat) and some vegetables, such as legumes. see carbohydrate and fat for the other two major classes
- (biochemistry) A large, complex molecule composed of long chains of amino acids linked by a peptide bond
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