BELLY BUTTON noun
Definition of belly button (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"
- synonyms: bellybutton, navel, omphalos, omphalus, umbilicus
Source: Princeton University Wordnet