Definition from Wiktionary, the free dictionary
See also Protein
- (biochemistry) Any of numerous large, complex naturally-produced molecules composed of one or more long chains of amino acids, in which the amino acid groups are held together by peptide bonds.
- (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
Coordinate terms 
Derived terms 
one of three major classes of food
biochemistry: a large, complex molecule composed of long chains of amino acids
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- ^ New Oxford Dictionary of English
protein n (uncountable)
Declension of protein