(n) a scar where the umbilical cord was attached, Syn. omphalus, bellybutton, umbilicus, omphalos, belly button, Example: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
The Collaborative International Dictionary of English (GCIDE) v.0.53 Collaborative International Dictionary (GCIDE)
‖n. [ NL., fr. Gr. mo`nos alone + &unr_; the navel. ] A form of double monster, in which two individuals are united by a common umbilicus. [ 1913 Webster ]