from
The Collaborative International Dictionary of English v.0.48
Ragnarok \Rag"na*rok"\ (r[.a]"n[.a]*r[o^]k"), Ragnarok
\Rag"na*r["o]k"\ (r[.a]"n[.a]*r[^u]k"), n. [Icel., fr. regin,
r["o]gn, gods + r["o]k reason, origin, history; confused with
ragna-r["o]kr the twilight of the gods.] (Norse Myth.)
The so-called "Twilight of the Gods" (called in German
{G["o]tterd[aum]mmerung}), the final destruction of the world
in the great conflict between the Aesir (gods) on the one
hand, and on the other, the giants and the powers of Hel
under the leadership of Loki (who is escaped from bondage).
[Webster 1913 Suppl.]