Etymology
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omphalos (n.)

also omphalus, "sacred stone," 1850, from Greek omphalos, literally "navel," later also "hub" (as the central point), from PIE *ombh-alo-, from root *nobh-/*ombh- "navel" (see navel). Especially as the name of the rounded or conical stone in the shrine at Delphi, regarded by the ancients as the center of the world. Related: Omphalic.

updated on August 24, 2019

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Definitions of omphalos from WordNet

omphalos (n.)
a scar where the umbilical cord was attached;
Synonyms: navel / umbilicus / bellybutton / belly button / omphalus
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.