Webster's Revised Unabridged Dictionary · 1913

Gotterdammerung

Gotterdammerung , noun

[German, lit. Twilight of the Gods; a modern mistranslation of the Old Icelandic Ragnarok, meaning, fate of the gods. RHUD]

1.
(German mythology) A myth about the ultimate destruction of the gods in a battle with evil. — RHUD
2.
An opera by Richard Wagner.

Also: Goetterdaemmerung