A condition in which there is a lack or abnormal deficiency of granulocytes in the blood.
Agranulocytosis is a condition associated with certain medications such as antithyroid drugs, antibiotics, cytotoxic drugs, and antiepileptic drugs.
Word origin: a, from the Greek, meaning without; granulocyte, a particular kind of cell; osis, from the Greek, meaning condition [esp. disorder].
See also: neutropenia, granulocytopenia.