2. umbilical cord, Hp.Superf.8, Oct.10, Sor.1.57, Gal.15.387.
II. anything like a navel,
2. button or knob in the middle of a yoke, 24.273.
III. centre or middle 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 called ὀ. as marking the middle point of Earth, Pi.P.4.74, B.4.4, A.Eu.40, 166(lyr.), cf. Pl.R.427c, Str.9.3.6, Paus. 10.16.3 ; also of an altar at Megara, Simon.107.9 (= IG7.53) ; ἄστεος ὀ., at Athens, Pi.Fr.75.3 ; νήσου ὀ., of Enna in Sicily, v.l. in Call. Cer.15, cf. Cic.Verr.4.48.106.
2. central part of a rose, containing the seed-vessel, Arist.Pr.907a20 ; of a pomegranate, Hp.Nat.Mul. 44, Gal.12.649 ; knob on an oak-gall, Thphr.HP3.7.5 ; button-shaped stalk of the fig, Gp.10.56.2.
3. centre of an army, Poll.1.126 ; prop. the point at which an army is divided into two wings, Ascl. Tact.2.6, cf. Arr.Tact.8.4, Ael.Tact.7.3.
4. keystone of an arched vault, Arist.Mu.399b30.
5. vault, tomb, MAMA3.402,712 (Corycus).