Um-bil'i-cus, n.

n. [Lat.] 1. (Anat.) A round cicatrix about the median line of the abdomen; the navel. Dunglison.

2. (Antiq.) An ornamented or painted ball or boss fastened at each end of the stick on which manuscripts were rolled. W. Smith.
3. (Bot.) The scar left where the stalk of the seed separates from the base; hilum.
4. (Conch.) A conical depression at the base of a univalve shell.
5. (Geom.) (a.) The focus of an ellipse, or other curve. [Obs.] (b.) A point of a surface through which all the lines of curvature pass.