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From: Webster's Revised Unabridged Dictionary (1913)

 Un·gu·la n.; pl. Ungulae
 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.