delusionist|dɪˈl(j)uːʒənɪst| [-ist.] a. One who is addicted to deluding. b. One given up to delusions. 1841A. W. Fonblanque in Life & Labours (1874) 151 The great delusionist is to make believe that he is pledged to the one [etc.].1845Carlyle Cromwell (1871) IV. 25 Day-dreaming Delusionists.