delirium

 
Pronunciation: /dɪˈlɪrɪəm/

noun

[mass noun]
  • an acutely disturbed state of mind characterized by restlessness, illusions, and incoherence, occurring in intoxication, fever, and other disorders: somewhere a patient shouted in delirium she had fits of delirium
  • wild excitement or ecstasy: a chorus of delirium from the terrace

Origin:

mid 16th century: from Latin, from delirare 'deviate, be deranged' (literally 'deviate from the furrow'), from de- 'away' + lira 'ridge between furrows'