Umbilicus in a sentence as a noun

Only when they noticed how many torches had solidified around an umbilicus -- a core of wood or bone to which the roll was attached -- did the true nature of the find become apparent.

Umbilicus definitions

noun

a scar where the umbilical cord was attached; "you were not supposed to show your navel on television"; "they argued whether or not Adam had a navel"; "she had a tattoo just above her bellybutton"

See also: navel bellybutton omphalos omphalus