The Collaborative International Dictionary of English v.0.48:
floorboard \floorboard\ n. 1. a board in the floor. Syn: floor board. [WordNet 1.5] 2. the floor of an automobile. [WordNet 1.5]WordNet (r) 3.0 (2006):
floorboard n 1: a board in the floor [syn: floorboard, floor board] 2: the floor of an automobile