| oneirology | The study of dreams and their content. Origin: G. Oneiros, dream, + logos, study (05 Mar 2000) |
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| oneiromancy | Divination by means of dreams. Origin: Gr. A dream + -mancy. Source: Websters Dictionary (01 Mar 1998) |
| oneirophrenia | A state in which hallucinations occur, caused by such conditions as prolonged deprivation of sleep, sensory isolation, and a variety of drugs. Origin: G. Oneiros, dream, + phren, mind (05 Mar 2000) |
| oneiroscopy | Rarely used term for the diagnosis of a person's mental state by an analysis of his dreams. Origin: G. Oneiros, dream, + skopeo, to examine (05 Mar 2000) |