delirium

Etymology

Borrowed from Latin dēlīrium (“derangement, madness”).

noun

  1. (medicine) A temporary mental state with a sudden onset, usually reversible, including symptoms of confusion, inability to concentrate, disorientation, anxiety, and sometimes hallucinations. Causes can include dehydration, drug intoxication, and severe infection.
    the delirium of the preceding session (of Parliament) 1879, John Morley, Burke
  2. Wild, frenzied excitement or ecstasy.

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