Definition: Leucocytopoiesis is a biological process in which specialized cells (leucocytes) develop from unidentifiable cells (cytoma). This process can be seen in various diseases, including leukemia. Leucocytes are responsible for removing waste products from the body and are involved in immune system functions such as phagocytosis. In simpler terms, it means that certain types of cells grow together to form a larger cell, much like a mushroom grows into a plant or a