Source : Webster's Revised Unabridged Dictionary (1913)

Ungula \Un"gu*la\, n.; pl. {Ungul[ae]}. [L., a claw, hoof, from
   unguis a nail, claw, hoof.]
   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.

   {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.