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Webster's Dictionary (1865)

Ŭn'gu-la, n.

noun

n. [Lat. ungula, a claw, hoof, from unguis, a nail, claw, hoof.]

  1. (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.
  2. (Surg.) A kind of hooked instrument for extracting a dead fetus from the womb. Crabb.
  3. (Bot.) The same as UNGUIS, 2, q. v.

Spherical ungula, a part of a sphere bounded by two planes intersecting in a diameter and by a lune of the surface. Math. Dict.