See also sleep.autism 1. a tendency to daydream. 2. Psychiatry. an extreme withdrawal into fantasy in thought or behavior, not correctible by external information. —autistic, adj. oneirocriticism the interpretation of dreams. —oneirocritic, n. —oneirocritical, adj. oneirodynia Medicine. a disturbed sleep, involving nightmare and sometimes sleepwalking. oneirology the science and interpretation of dreams. Also oneiroscopy. oneiromancy a form of divination involving dreams. —oneiromancer, n. phantasmagoria a type of magic-lantern show in which rapidly moving images blend, change size, etc.; hence, any series of images that move and change rapidly, as a dream. —phantasmagorial, phantasmagoric, adj. pnigalion a nightmare. reverist a person much inclined to dream, especially to day-dream; a dreamy person.