Path. [f. L. umbilīc-us UMBILICUS + -ATION.] A central depression on the upper part of a pock or other vesicle on the skin; also, the condition of being so depressed.
1873. F. T. Roberts, Handbk. Med., 182. After a while the umbilication disappears, the pock becoming either rounded or pointed at the top.
1880. A. Flint, Princ. Med., 618. The umbilication, which can sometimes be felt on the cancerous nodules, may be of assistance in the diagnosis.
1899. Allbutt’s Syst. Med., VIII. 876. As the tumour increases in size, one or more depressions, or umbilications, are observed on the surface.
