The Collaborative International Dictionary of English v.0.48:
Ungula \Un"gu*la\, n.; pl. Ungulae. [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
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.