halogenate Syllabification: (hal·o·gen·ate)Pronunciation: /ˈhaləjəˌnāt, haˈläjə-/Definition of halogenate verb [with object] (usually as adjective halogenated) Chemistry introduce one or more halogen atoms into (a compound or molecule), usually in place of hydrogen. Derivatives halogenationPronunciation: /ˌhaləjəˈnāSHən, həˌläjə-/ noun halogenate in other Oxford dictionaries Definition of halogenate in the British & World English dictionary