BERSERKER
berserker, berserk
(noun) one of the ancient Norse warriors legendary for working themselves into a frenzy before a battle and fighting with reckless savagery and insane fury
Source: WordNet® 3.1
Etymology
Noun
berserker (plural berserkers)
A berserk (a crazed Norse warrior who fought in a frenzy).
One who fights as if frenzied, like a berserker.
(science fiction) A type of von Neumann probe whose mission is to exterminate alien lifeforms.
Source: Wiktionary
Ber"serk, Ber"serk*er, n. Etym: [Icel. berserkr.]
1. (Scand. Myth.)
Definition: One of a class of legendary heroes, who fought frenzied by
intoxicating liquors, and naked, regardless of wounds. Longfellow.
2. One who fights as if frenzied, like a Berserker.
Source: Webster’s Unabridged Dictionary 1913 Edition