gelignite Syllabification: (gel·ig·nite)Pronunciation: /ˈjeligˌnīt/Translate gelignite | into German | into Italian Definition of gelignite noun a high explosive made from a gel of nitroglycerine and nitrocellulose in a base of wood pulp and sodium or potassium nitrate, used particularly for rock blasting. Origin: late 19th century: probably from gelatin + Latin (l)ignis 'wood' + -ite1gelignite in other Oxford dictionaries Definition of gelignite in the British & World English dictionary