protein - any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes; "a diet high in protein"

thyroprotein - a preparation made from iodinated protein and having an action similar to thyroxine

thyroglobulin - an iodine containing protein that is obtained from the thyroid gland and exhibits the general properties of the globulins