ungula

Unguis \Un"guis\, n.; pl. {Ungues}. [L., nail, claw, or hoof.]
   1. The nail, claw, talon, or hoof of a finger, toe, or other
      appendage.
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   2. (Zool.) One of the terminal hooks on the foot of an
      insect.
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   3. (Bot.) The slender base of a petal in some flowers; a
      claw; called also {ungula}.
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Ungula \Un"gu*la\, n.; pl. {Ungulae}. [L., a claw, hoof, from
   unguis a nail, claw, hoof.]
   1. A hoof, claw, or talon.
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   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.
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   3. (Bot.) Same as {Unguis}, 3.
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   {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.
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