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(Science: haematology) leucocyte with conspicuous cytoplasmic granules. In humans the granulocytes are also classified as polymorphonuclear leucocytes and are subdivided according to the staining properties of the granules into eosinophils, basophils and neutrophils (using a Romanovsky type stain), some invertebrate blood cells are also referred to, not very helpfully, as granulocytes.