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1. 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. An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled. 3. The hilum. 4. A depression or opening in the center of the base of many spiral shells. 5. Either one of the two apertures in the calamus of a feather. 6. One of foci of an ellipse, or other curve. 7. 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. 8. scar where the umbilical cord was attached 
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