ὀμφαλός (cf. umbilicus):
navel, Il. 4.525,
Il. 21.180; fig., θαλάσσης, Od.
1.50; then (1) of a shield, boss, the
projection in the centre ending in a button or point; pl.,
studs, serving as ornaments, Il. 11.34.—(2) of a yoke, knob, or
pin, on the centre (see cut No. 45 α),
Il. 24.273. The Assyrians had the
same (see cut No. 51), while the Egyptians ornamented the ends of the
yoke with a ball of brass. (See cut No. 92 on next page.)