Ungula

n. pl. Ungulæ (#).
  1. A hoof, claw, or talon.
  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.
  3. (Bot.) Same as Unguis, 3.
    4. 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.