ungula

‖n.; pl. Ungulae [ L., a claw, hoof, from unguis a nail, claw, hoof. ] 1. A hoof, claw, or talon. [ 1913 Webster ]

2. (Geom.) A section or part of a cylinder, cone, or other solid of revolution, cut off by a plane oblique to the base; -- so called from its resemblance to the hoof of a horse. [ 1913 Webster ]

3. (Bot.) Same as Unguis, 3. [ 1913 Webster ]

Spherical ungula (Geom.), a part of a sphere bounded by two planes intersecting in a diameter and by a line of the surface of the sphere. [ 1913 Webster ]