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.
Examples of long haul in a sentence. 1  Driving across the country would be a long haul. 2  growing up in suburban New England, I used to think the 10 miles between our house and the mall was a long haul.