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 um·bi·li·cus /ˌʌmˈbɪlɪkəs, ˌʌmbəˈlaɪ-/
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 um·bi·li·cus /ˌəmˈbɪlɪkəs, ˌəmbəˈlaɪ-/ 名詞

 Um·bi·li·cus n.
 1. 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.
 2. Gr. & Rom. Antiq. An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.
 3. Bot. The hilum.
 4. 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.
 5. 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.
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 umbilicus
      n : scar where the umbilical cord was attached [syn: navel, bellybutton,
           omphalos, omphalus]
      [also: umbilici (pl)]