Question: why leukocytes are called so?
Answer: The white blood cells are called leukocytes (from the Greek “leukos” meaning “white” and “kytos,” meaning “cell”). The granular leukocytes (eosinophils, neutrophils, and basophils) are named for the granules in their cytoplasm; the agranular leukocytes (monocytes and lymphocytes) lack cytoplasmic granules.