['di:mәu'gɔ:g әn]
n.
(古代神话中的)魔王,冥府之神

[ noun ]
(Greek mythology) a mysterious and terrifying deity of the underworld
<noun.person>

Demogorgon \De`mo*gor"gon\ (d[=e]"m[-o]*g[^o]r*g[o^]n or
d[e^]m"[-o]*g[^o]r*g[o^]n), n. [First mentioned by Lutatius,
or Lactantius Placidus, the scholiast on Statius, perh. fr.
Gr. dai`mwn god, deity + gorgo`s fierce, terrible]
A mysterious, terrible, and evil divinity, regarded by some
as the author of creation, by others as a great magician who
was supposed to command the spirits of the lower world. See
{Gorgon}.

Orcus and Ades, and the dreaded name
Of Demogorgon. --Milton.