ὀμφᾰλός,ὁ,
A. navel,
Il. 4.525 , 13.568 , Hdt. 7.60 , etc.
2. umbilical cord,
Hp. Superf. 8 , Oct. 10 , Sor. 1.57 , Gal. 15.387 .
II. anything like a navel,
1. knoborboss,
Il. 11.34 ; esp. in middle of shield, 13.192 , etc.
2. buttonorknobin the middle of a yoke, 24.273 .
3. plugorvalve closing outlet of bath,Timarch. ap. Ath. 11.501f ; cf.βαλανειόμφαλος.
4. pl.,knobs at ends of stick round which books wererolled,
Luc. Merc.Cond. 41 , Ind. 7 , 16 , AP 9.540 .
III. centreormiddle point: νήσῳ ἐν ἀμφιρύτῃ, ὅθι τ' ὀ. ἐστι θαλάσσης
Od. 1.50
(only here in Od. ) ; later Delphi (or rather a round stone in the Delphic temple) was calledὀ.as marking themiddle point of Earth,