• (RP) IPA: /ˈpɹəʊti.ɪn/, /ˈpɹəʊtiːn/
  • (America) IPA: /ˈpɹoʊtiːn/


  1. (biochemistry, countable) 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.
    Synonyms: Thesaurus:protein
    meronyms en
  2. (nutrition, uncountable) 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.
    Synonyms: Thesaurus:protein
    Coordinate terms: carbohydrate#English|carbohydrate, fat#English|fat
  3. (nutrition, countable) A food rich in protein, often a meat or meat substitute.
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