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delirium

/dɪˈlɪɹ.i.əm/ noun C2
  1. 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. (countable, uncountable)
  2. Wild, frenzied excitement or ecstasy. (countable, uncountable)

Plural deliriums

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“Sometimes I have thought that it was merely the wild talk of delirium, sometimes that it may have referred to some band of people, perhaps to these very gipsies in the plantation.
The Adventures of Sherlock Holmes, p. 46 · B2
I will not see him." Then she seemed to wander off into delirium.
The Case-Book of Sherlock Holmes, p. 63 · B2
All this was said with such exceeding rapidity, that there was something in the conversation that seemed like the beginning of delirium.
The Count of Monte Cristo, p. 745 · C1
It must have been delirium; she fancies, too, that she saw a phantom enter her chamber and even heard the noise it made on touching her glass.”
The Count of Monte Cristo, p. 750 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.