Basophil
Basophil : A structure, cell, or other histologic element staining readily with basic dyes. 2. a granular leukocyte with an irregularly shaped, relatively pale-staining nucleus that is partially constricted into two lobes, and with cytoplasm that contains coarse, bluish-black granules of variable size. Basophils contain vasoactive amines, e.g., histamine and serotonin, which are released on appropriate stimulation