Proteins, from the Greek proteios, meaning first, are a class of organic compounds which are present in and vital to every living cell. In the form of skin, hair, callus, cartilage, muscles, tendons and ligaments, proteins hold together, protect, and provide structure to the body of a multi-celled organism. In the form of enzymes, hormones, antibodies, and globulins, they catalyze, regulate, and protect the body chemistry.
Definition of long division for Students. : division in arithmetic that involves several steps that are written out.
Definition of division. 1  1a : the act or process of dividing : the state of being dividedb : the act, process, or an instance of distributing among a number : distributionc obsolete : a method of arranging or disposing (as troops) 2  2 : one of the parts or groupings into which a whole is divided or is divisible.