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1. Moby Thesaurus II by Grady Ward, 1.0
axis, center, center of action, center of gravity, centroid, centrum, core, dead center, epicenter, heart, hub, kernel, marrow, medulla, metacenter, middle, nave, navel, nub, nucleus, omphalos, pith, pivot, storm center
Dictionary Results for umbilicus:
1. WordNet® 3.0 (2006)
    n 1: a scar where the umbilical cord was attached; "you were not
         supposed to show your navel on television"; "they argued
         whether or not Adam had a navel"; "she had a tattoo just
         above her bellybutton" [syn: navel, umbilicus,
         bellybutton, belly button, omphalos, omphalus]

2. The Collaborative International Dictionary of English v.0.48
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; the belly
      button, in humans.
      [1913 Webster]

   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.
      [1913 Webster]

   3. (Bot.) The hilum.
      [1913 Webster]

   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
          [1913 Webster]

   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.
          [1913 Webster]

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