Main Entry: ¹um·bil·i·cal

Pronunciation: \ˌəm-ˈbi-li-kəl, British also ˌəm-bə-ˈlī-kəl\

Function: adjective

Date: 1541

1 : of, relating to, or used at the navel
2 : of or relating to the central region of the abdomen
3 : being a necessary or nurturing link or connection <the town's umbilical rail line>