Had.es |ˈhādēz| Greek Mythology

the underworld; the abode of the spirits of the dead.
• the god of the underworld, one of the sons of Cronus. Roman equivalent Pluto.

DERIVATIVES
Ha.de/an |ˈhādēən| adjective

ORIGIN from Greek Haidēs, of unknown origin.

ha.de |hād| Geology
noun
the inclination of a mineral vein or fault from the vertical.

verb [intrans.]
(of a shaft, vein, or fault) incline from the vertical: it was hading eighteen inches for every fathom in depth.

ORIGIN late 17th cent.: perhaps a dialect form of the verb head.