A cell, especially a white blood cell, having granules that stain readily with basic dyes.
A cell, substance, or tissue easily stained by basic dyes, as the beta cells in the anterior pituitary or certain white blood cells.
Webster's New World
A white blood cell that when activated releases histamine and other substances that are involved in allergic reactions. Basophils are found chiefly in the blood and sites of inflammation and have cytoplasmic granules that are stained with basic dyes.