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.
Example Sentences for overlap. 1  His long legs were drawn up close to his chinâhis broad shoulders seemed to overlap his body. 2  For this overlap geological reasons are given, into which we cannot now enter. 3  This distance is measured, and forms the length of thread allowed to overlap the support.