👉 In biology, leucocytozoon refers to a type of cell that contains only one type of cell or cells. These cells are called leucocytes and they are found in many different body systems such as the nervous system, immune system, and blood. The term is derived from the Greek word "leukos" which means "white," and "cytozoon," meaning "cell." Therefore, a leucocytozoon cell would be considered an abnormal or dise