navel

(noun) a scar where the umbilical cord was attached. Synonyms: umbilicus, bellybutton, belly button, omphalos, omphalus. Examples: "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."

(noun) the center point or middle of something. Synonyms: navel point. Example: "The incas believed that cuzco was the navel of the universe."