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Home > Health A â Z > Psychosis. A severe mental disorder in which a person loses the ability to recognize reality or relate to others. Symptoms include being paranoid, having false ideas about what is taking place or who one is, and seeing, hearing, or feeling things that are not there. PubMed Health Glossary.
Neurosis is a class of functional mental disorders involving distress but neither delusions nor hallucinations. Neurosis may also be called psychoneurosis or neurotic disorder.ccording to the American Heritage Medical Dictionary, neurosis is no longer used in psychiatric diagnosis.. The term is derived from the Greek word Î½Îµá¿¦ÏÎ¿Î½ (neuron, nerve) and the suffix -ÏÏÎ¹Ï -osis (diseased or abnormal condition).