clon·i·dine (klŏn'ĭ-dēn', klō'nĭ-) n. A synthetic drug, C9H9Cl2N3, used in the treatment of hypertension, the prevention of migraine headaches, and the management of Tourette's syndrome and opiate withdrawal.
Main Entry: clo·ni·dine Pronunciation: 'klän-&-"dEn, 'klOn-, -"dIn Function: noun : an antihypertensive drugC9H9Cl2N3 used especially to treat essential hypertension, to prevent migraine headache, and to diminish opiate withdrawal symptoms