[noun] [U]We're very worried about Paul because he's been in a state of delirium (= has been unable to think or speak clearly because of fever) for so long.I've never seen such delirium (= excited happiness) at a football match before.Delirium tremens is (formal) for dts.
DELIRIUM
Meaning of DELIRIUM in English
Cambridge English vocab. Кембриджский английский словарь. 2012