means Relating to the navel or the cord that connects a fetus to the placenta, or by extension any vital connecting link.

from From Latin umbilicus, meaning 'navel,' which is a cousin of the Latin umbo, the boss or central knob on a shield. The same family reaches back to a Proto-Indo-European root that also gave English 'navel' and Greek omphalos — the sacred navel-stone the Greeks placed at Delphi to mark the center of the world. So the word for your belly button shares ancestry with the ancients' idea of the world's own midpoint.