eosinophil

This term describes a specialized leukocyte characterized by its affinity for acidic dyes. In a clinical setting, the presence of these cells is a primary biomarker for identifying hypersensitivity responses or the presence of helminths in the body. As a biological entity, it is a countable noun. While it refers to a microscopic cell, it follows standard English pluralization rules, though it is almost exclusively used within medical and pathological discourse.