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plural granulocytes
(cytology, immunology) Any of various white blood cells that have granules in their cytoplasm. quotations
This is easily explained, because pathological cells that are only occasional wanderers into the free circulation, aside from the granulocyte group, probably all are "mononuclear" , "non-granular", and "large" , characteristics which, all authors agree, brand cells as belonging to the "large lymphocytes".
1908 September, Charles A. Elliott, “The atypical and large mononuclear cells of the blood”, in Quarterly Bulletin of the Northwestern University Medical School, volume 10, number 2, page 2