omphalus
WordNet
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(n)
omphalus
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"
Usage in literature
They separated directly in the Omphalus. "Ben-Hur: A Tale of the Christ" by
Pausanias mentions an Omphalus in the Peloponnesus, which was said to have been the middle of that country. "A New System; or, an Analysis of Antient Mythology. Volume I." by