/ dɪˈlɪriəm; NAmE ; BrE also -ˈlɪəriəm/ noun
[ U ] a mental state where sb becomes delirious , usually because of illness :
fits of delirium
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WORD ORIGIN
mid 16th cent.: from Latin , from delirare deviate, be deranged (literally deviate from the furrow), from de- away + lira ridge between furrows.