Biol. any structure, cell, etc. readily stainable with eosin; esp., the granular white blood cells that increase greatly in number in certain allergic and parasitic diseases
Origin of eosinophileosin + -o- + -phil
A white blood cell that functions in the immune response by releasing enzymes that can kill parasites and other pathogens. Eosinophils are found chiefly in connective tissue and contain granules that are stained by eosin or other acid dyes.
- (cytology, immunology) A white blood cell responsible for combating infection by parasites in the body.