smokestack Syllabification: (smoke·stack)Pronunciation: /ˈsmōkˌstak/Definition of smokestack noun a chimney or funnel for discharging smoke from a locomotive, ship, factory, etc. and helping to induce a draft. [as modifier] pertaining to heavy industry:America’s smokestack cities and blue-collar suburbssmokestack in other Oxford dictionaries Definition of smokestack in the British & World English dictionary