omphalos

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om·pha·los

(om'fă-los),
Rarely used term for umbilicus.
[G. navel]

omphalos

(ŏm′fə-lŏs′, -ləs)
n. pl. ompha·li (-lī)
1. The navel.
2. A central part; a focal point.
3. Any of various stones revered as sacred in ancient Greek civilization, representing the center of the world.