Protein

n.	1.	(Physiol. Chem.) In chemical analysis, the total nitrogenous material in vegetable or animal substances, obtained by multiplying the total nitrogen found by a factor, usually 6.25, assuming most proteids to contain approximately 16 per cent of nitrogen.
	1.	(Physiol. Chem.) any polymer of an amino acid joined by peptide (amide) bonds. Most natural proteins have alpha-amino acids as the monomeric constituents. All classical enzymes are composed of protein, and control most of the biochemical transformations carrie dout in living cells. They may be soluble, as casein, albumins, and other globular proteins, or insoluble (e. g. "structural proteins"), as collagen or keratin. "albumin", an older term for protein, is now used primarily to refer to certain specific soluble globular proteins found in eggs or blood serum, e.g. bovine serum albumin, the main soluble protein in teh serum of cattle, used as an enzymatically inert protein in biochemical research. Protein crystal (Bot.) See Crystalloid, n., 2.

Noun

1.

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"

Pronunciation: (PROH-teen) One of the three nutrients that provides calories to the body. Protein is an essential nutrient that helps build many parts of the body, including muscle, bone, skin, and blood. Protein provides 4 calories per gram and is found in foods like meat, fish, poultry, eggs, dairy products, beans, nuts, and tofu.

albumin, albuminoid, amino acid, androcyte, antheridium, antherozoid, casein, chlorophyll, chromoprotein, collagen, dipeptide, edestin, elastin, fibroin, globin, globulin, glutenin, glycoprotein, hemoglobin, histone, ichthulin, interferon, lactalbumin, lecithoprotein, lipid, lipoprotein, lysozyme, male gamete, milt, mucin, nucleohistone, nucleoprotein, oryzenin, osseomucoid, peptide, peptone, phosphoaminolipide, phosphoprotein, pollen, prolamine, protamine, proteid, proteose, protide, salmine, scum, seed, semen, seminal fluid, serum globulin, sperm, sperm cell, spermagonium, spermatic fluid, spermatid, spermatiophore, spermatium, spermatocyte, spermatogonium, spermatophore, spermatozoa, spermatozoid, spermatozoon, tendomucin, thymus histone, zein