Definition of protein

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< proteid

proteinase >

pro·tein    (prtn, -t-n) KEY 

NOUN:

Any of a group of complex organic macromolecules that contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur and are composed of one or more chains of amino acids. Proteins are fundamental components of all living cells and include many substances, such as enzymes, hormones, and antibodies, that are necessary for the proper functioning of an organism. They are essential in the diet of animals for the growth and repair of tissue and can be obtained from foods such as meat, fish, eggs, milk, and legumes.

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ETYMOLOGY:
French protéine, from Late Greek prteios, of the first quality, from Greek prtos, first; see per¹ in Indo-European roots

OTHER FORMS:
protein·aceous  (prtn-shs, prt-n-) KEY  or pro·teinic  (pr-tnk) KEY  or pro·teinous  (pr-tns) KEY (Adjective)