Delirium

Part of speech: noun (n.)

1. A state in which the thoughts, expressions, and actions are wild, irregular, and incoherent; mental aberration; a roving or wandering of the mind, -- usually dependent on a fever or some other disease, and so distinguished from mania, or madness.

2. Strong excitement; wild enthusiasm; madness. The popular delirium [of the French Revolution] at first caught his enthusiastic mind. W. Irving. The delirium of the preceding session (of Parliament). Motley. Delirium tremens (. Etym: [L., trembling delirium] (Med.), a violent delirium induced by the excessive and prolonged use of intoxicating liquors. -- Traumatic delirium (Med.), a variety of delirium following injury.

Synonyms: Insanity; frenzy; madness; derangement; aberration; mania; lunacy; fury. See Insanity.