omphalosPronunciation: /ˈɒmfəlɒs/Definition of omphalos noun (plural omphaloi /-lɔɪ/) 1 literary the centre or hub of something:this was the omphalos of confusion 2(in ancient Greece) a conical stone (especially that at Delphi) representing the navel of the earth. a boss on an ancient Greek shield. Origin:Greek, literally 'navel, boss'omphalos in other Oxford dictionaries Definition of omphalos in the US English dictionary