The Collaborative International Dictionary
Omphalo-
Omphalo- \Om"pha*lo-\ [Gr. ? the navel.] A combining form indicating connection with, or relation to, the umbilicus, or navel.
Douglas Harper's Etymology Dictionary
omphalo-
before vowels omphal-, word-forming element meaning "navel," from Greek omphalos (see omphalos).
Wiktionary
omphalo-
pre. Relating to the navel.