資料來源 : pyDict

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資料來源 : Webster's Revised Unabridged Dictionary (1913)

Umbilicus \Um`bi*li"cus\, n. [L. See {Umbilic}.]
   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.

   2. (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.

   3. (Bot.) The hilum.

   4. (Zo["o]l.)
      (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 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}.

資料來源 : WordNet®

umbilicus
     n : scar where the umbilical cord was attached [syn: {navel}, {bellybutton},
          {omphalos}, {omphalus}]
     [also: {umbilici} (pl)]