Ungula

from The Century Dictionary.

• noun A slightly hooked or blunt nail—that is, a hoof, as of the horse, ox, etc.; also, a claw or nail of any kind; a talon.
• noun In geometry, a part cut off from a cylinder, cone, etc., by a plane passing obliquely through the base and part of the curved surface: so named from its resemblance to the hoof of a horse.
• noun In surgery, an instrument for extracting a dead fetus from the womb.
• noun In botany, same as unguis, 5.
• noun [capitalized] [NL. (Pander, 1830).] A genus of brachiopods: same as Obolus, 3, and Ungulites.

from the GNU version of the Collaborative International Dictionary of English.

• noun A hoof, claw, or talon.
• noun (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.
• noun (Bot.) Same as Unguis, 3.
• noun (Geom.) a part of a sphere bounded by two planes intersecting in a diameter and by a line of the surface of the sphere.