GNU Collaborative International Dictionary of English

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1.       
   ‖Umbilicus , n. [L. See Umbilic.]
   (Anat.) The depression, or mark, in the median line of the abdomen, which indicates the point where the umbilical cord separated from the fetus; the navel; the belly button, in humans.
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   (Gr. & Rom. Antiq.) An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.
   Dr. W. Smith.
   
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   (Bot.) The hilum.
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   (Zool.) (a) A depression or opening in the center of the base of many spiral shells. (b) Either one of the two apertures in the calamus of a feather.
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   (Geom.) (a) One of the foci of an ellipse, or other curve. [Obs.] (b) 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. Called also umbilic.
   1913 Webster