“white blood”

: any of the white blood cells that have granules in their cytoplasm having specific affinity for certain biological stains and that include the eosinophils, basophils, and neutrophils compare nongranular white blood cell

: any of the white blood cells that usually lack granules in their cytoplasm having an affinity for specific biological stains and that include the lymphocytes and monocytes compare granular white blood cell

: any of the blood cells of the immune system that are colorless, lack hemoglobin, contain a nucleus, and include the lymphocytes, monocytes, neutrophils, eosinophils, and basophils along with their precursors and derivatives (as macrophages) : leukocyte —abbreviation WBC compare red blood cell