Umbilicus

Noun

  • (zoology) Either of the two apertures in the calamus of a feather.
  • (geometry) A point of a surface at which the curvatures of the normal sections are all equal to each other.

    "A sphere may be osculatory to the surface in every direction at an umbilicus."

  • (zoology) A depression or opening in the center of the base of many spiral shells.
  • (geometry, obsolete) One of the foci of an ellipse or other curve.
  • (botany) hilum
  • (space science) A tube connecting an astronaut or spacecraft to the mothership, through which supplies and samples can be transferred.
  • (historical) An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.
  • (anatomy) navel

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