counterirritant Syllabification: (coun·ter·ir·ri·tant)Pronunciation: /ˌkountərˈiritənt/Definition of counterirritant noun something such as heat or an ointment that is used to produce surface irritation of the skin, thereby counteracting underlying pain or discomfort. Derivatives counterirritationPronunciation: /-ˌiriˈtāSHən/ noun counterirritant in other Oxford dictionaries Definition of counterirritant in the British & World English dictionary