| the innermost digit of the forelimb; thumb. |
| the depression in the center of the surface of the abdomen indicating the point of attachment of the umbilical cord to the embryo; navel. |
pathognomonic pa·thog·no·mon·ic (pə-thŏg'nə-mŏn'ĭk, pāth'əg-nō-)
adj.
Characteristic or symptomatic of a particular disease or condition.