protein
/ˈpɹəʊti.ɪn/ · pro·tein
noun
- 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. Hemoglobin is a protein that transports oxygen in the blood.
- (nutrition) One of three major classes of food or source of food energy (4 kcal/gram) abundant in animal-derived foods (i.e., meat) and some vegetables, such as legumes. Eggs and beans are excellent sources of protein.
- (nutrition) A food rich in protein, often a meat or meat substitute. Tofu is a popular plant‑based protein for vegetarians.
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Did you know? The term 'protein' was introduced by Jöns Jacob Berzelius in 1838, derived from the Greek proteios meaning ‘primary’, because proteins were thought to be the primary substances of life.