| the depression in the center of the surface of the abdomen indicating the point of attachment of the umbilical cord to the embryo; navel. |
| the basinlike cavity in the lower part of the trunk of many vertebrates, formed in humans by the innominate bones, sacrum, etc. |
operative op·er·a·tive (ŏp'ər-ə-tĭv, -ə-rā'tĭv, ŏp'rə-)
adj.
Of, relating to, or resulting from a surgical operation.
Functioning effectively; efficient.