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From 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. [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]