(Science: anatomy) An organ that produces lymphocytes, filters the blood, stores blood cells and destroys those that are aging. It is located on the left side of the abdomen near the stomach. A large dark-red oval organ on the left side of the body between the stomach and the diaphragm; produces cells involved in immune responses.This lymphoid tissue is primarily concerned with blood cells, being the site of production of [[lymphocytes which regulates the volume of blood cells in the blood stream and removes defective cells. It also actsa as a reservoir for blood and is the site where red blood cells reaching the end of their functional life are broken down.

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