floorboard Syllabification: (floor·board)Pronunciation: /ˈflôrˌbôrd/Translate floorboard | into French | into German | into Italian | into Spanish Definition of floorboard noun a long plank making up part of a wooden floor in a building. North American the floor of a motor vehicle:the keys had fallen on the floorboard of her carfloorboard in other Oxford dictionaries Definition of floorboard in the British & World English dictionary