Eosinophil

Eosinophil is a type of white blood cell rich in granules that stain with eosin and play a key role in the body's immune response, especially in combating parasitic infections and in allergic reactions. In anatomy and medicine, the term denotes a specific leukocyte subclass, identifiable by characteristic staining and surface markers. It is used widely in hematology, pathology, and immunology contexts.