Liddell-Scott-Jones

ὀμφαλός (omphalos) anavel ^G:N-M

ὀμφαλός, ὁ,

navel, [Refs 8th c.BC+]

__2 umbilical cord, [Refs 5th c.BC+]
__II anything like a navel,
__II.1 knob or boss, [Refs 8th c.BC+]; especially in middle of shield, [Refs]
__II.2 button or knob in the middle of a yoke, [Refs]
__II.3 plug or valve closing outlet of bath, Timarch. cited in [Refs 2nd c.AD+]; compare βαλανειόμφαλος.
__II.4 plural, knobs at ends of stick round which books wererolled, [Refs 2nd c.AD+]
__III centre or middle point: νήσῳ ἐν ἀμφιρύτῃ, ὅθι τ᾽ ὀ. ἐστι θαλάσσης [Refs 8th c.BC+]; later Delphi (or rather a round stone in the Delphic temple) was called ὀ. as marking the middle point of Earth, [Refs 5th c.BC+]; also of an altar at Megara, [Refs 4th c.BC+]; ἄστεος ὀ., at Athens, [Refs 5th c.BC+]; νήσου ὀ., of Enna in Sicily, variant in [Refs 3rd c.BC+]
__III.2 central part of a rose, containing the seed-vessel, [Refs 4th c.BC+]; of a pomegranate, [Refs 5th c.BC+]; knob on an oak-gall, [Refs 4th c.BC+]; button-shaped stalk of the fig, [Refs]
__III.3 centre of an army, [Refs 2nd c.AD+]; properly the point at which an army is divided into two wings, [Refs 1st c.BC+]
__III.4 keystone of an arched vault, [Refs 4th c.BC+]
__III.5 vault, tomb, [Refs]
__IV γῆς ὀ., ={κοτυληδών}, navel-wort, Cotyledon Umbilicus, Ps.-[Refs 1st c.AD+]. (Cf. Latin umbilicus, umbo, probably from ombh-: Sanskrit nābhis, O[Refs 5th c.BC+] nafel 'navel', apparently from ombh-.)