Definition: Anhaematopoiesis is the process by which blood cells are produced in the bone marrow. It is crucial for maintaining the body's ability to fight infection. The term 'anhaematopoiesis' comes from the Greek word 'anthemata', which means "blood," and the Latin root 'poesis,' meaning 'to produce.' This explains the concept of anhaematopoiesis as producing new blood cells, which are crucial for the body's defense mechanisms.