pinkeye Syllabification: (pink·eye)Pronunciation: /ˈpiNGkˌī/Definition of pinkeye noun 1conjunctivitis in humans and some livestock. 2a viral disease of horses, symptoms of which include fever, spontaneous abortion, and redness of the eyes. The virus belongs to the genus Arterivirus pinkeye in other Oxford dictionaries Definition of pinkeye in the British & World English dictionary