A colorless corpuscle, as one of the white blood corpuscles, or those found in lymph, marrow of bone, connective tissue, etc.
a mature blood cell which contains a nucleus. Leucocytes, e.g. monocytes, lymphocytes and granulocytes, are found in the blood or tissue fluid. They are part of the body's immune system. It is also known as a white blood cell.
blood cells that engulf and digest bacteria and fungi; an important part of the body's defense system