Leukocytes
Means "White cells" and refers to the White Blood Cells (WBCs) which include Granulocytes (Neutrophil, Eosinophil, Basophil), monocytes, and lymphocytes and their precursors. The leukocyte precursors (e.g. promyelocyte, myelocyte, metamyelocyte) are usually seen in the bone marrow and absent in blood of normal individuals.