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Umbilicus

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(1):

(n.) An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled.

(2):

(n.) The hilum.

(3):

(n.) A depression or opening in the center of the base of many spiral shells.

(4):

(n.) Either one of the two apertures in the calamus of a feather.

(5):

(n.) One of foci of an ellipse, or other curve.

(6):

(n.) 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.

(7):

(n.) 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.