a. Having a head like that of a nail; formed so as to resemble the head of a nail. [ 1913 Webster ]

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. [ 1913 Webster ]