agranulocytosis A decrease in the number of mature granulocytes (neutrophils, eosinophils, and basophils) in the peripheral blood. DOID:12987 GARD:0006545 Granulocytopenic disorder Granulopenia ICD10:D70 ICD9:288.8 MESH:D000380 MONDO:0001609 NCIT:C2863 SCTID:417672002 UMLS:C0001824 granulocytopenia leukopenia