Home › Words › U › undertrayundertrayundertray means A separate floor in a car, bolted onto the underside of the monocoque.Among words judged in Lexicurio's Arena, undertray ranks #37,340 of 42,762 for Qualifying.EtymologyFrom under- + tray.nounA separate floor in a car, bolted onto the underside of the monocoque.Definitions & examples from Wiktionary (CC BY-SA 3.0).