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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. 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 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.

 

© Webster 1913.