σφονδύλιος

Etymology
A Homeric hapax legomena, Iliad 20.483.

Noun
from the spine; and Deucalion lay extended on the ground [Buckley]
 * 1) one of the vertebrae of the neck
 * 2) μυελὸς αὖτε σφονδυλίων ἔκπαλθ', ὃ δ' ἐπὶ χθονὶ κεῖτο τανυσθείς. (Iliad 20.483) and the marrow sprang forth