Nail-headed \Nail"-head`ed\, a. Having a head like that of a nail; formed so as to resemble the head of a nail. {Nail-headed characters}, arrowheaded or cuneiform characters. See under {Arrowheaded}. {Nail-headed molding} (Arch.), an ornament consisting of a series of low four-sided pyramids resembling the heads of large nails; -- called also {nail-head molding}, or {nail-head}. It is the same as the simplest form of dogtooth. See {Dogtooth}.