[de.lir.i.um] n [L, fr. delirare to be crazy, lit., to leave the furrow (in plowing), fr. de- + lira furrow--more at learn] (ca. 1563) 1: a mental disturbance characterized by confusion, disordered speech, and hallucinations
2: frenzied excitement "he would stride about his room in a ~ of joy --Thomas Wolfe"