omphalos Syllabification: (om·pha·los)Pronunciation: /ˈämfələs/Definition of omphalos noun (plural omphaloi /-loi/) literary the center or hub of something:this was the omphalos of confusion and strife a rounded stone (especially that at Delphi) representing the navel of the earth in ancient Greek mythology. Origin:Greek, literally 'navel'omphalos in other Oxford dictionaries Definition of omphalos in the British & World English dictionary