psychosis

noun

psy·​cho·​sis sī-ˈkō-səs 

plural psychoses sī-ˈkō-ˌsēz 

: a serious mental illness (such as schizophrenia) characterized by defective or lost contact with reality often with hallucinations or delusions

Examples of psychosis in a Sentence

The patient suffers from some kind of psychosis.

Recent Examples on the Web

Catherine was the queen of self-abusing, hard-living, and heading-over-the-hill entertainment veterans — women who were trapped behind a façade of slick showbiz tics that barely covered the active volcano of psychosis bubbling right under their surface. —Merrill Markoe, Rolling Stone, 1 Feb. 2026

For the first time in months, no meth psychosis obstructed my view. —Nick Dothée, Los Angeles Times, 30 Jan. 2026

Treatment generally involves a life-long combination of therapy and medication that is used to stabilize mood and alleviate psychosis. —Martha Ross, Mercury News, 27 Jan. 2026

Psychiatrists suggested that chatbot models should contain reality-testing nudges to avoid AI psychosis. —Rafil Kroll-Zaidi, Harpers Magazine, 27 Jan. 2026

Word History

Etymology

New Latin

First Known Use

1847, in the meaning defined above

Rhymes for psychosis

• cirrhosis
• fibrosis
• gliosis
• hypnosis
• ichthyosis
• ketosis
• kurtosis
• lordosis
• meiosis
• miosis
• mitosis
• mycosis

Kids Definition

psychosis

noun

psy·​cho·​sis sī-ˈkō-səs 

plural psychoses -ˈkō-ˌsēz 

: a serious mental illness marked by loss of or greatly lessened ability to test whether what one is thinking and feeling about the real world is really true

Medical Definition

psychosis

noun

psy·​cho·​sis sī-ˈkō-səs 

plural psychoses -ˌsēz 

: a serious mental illness (as schizophrenia) characterized by defective or lost contact with reality often with hallucinations or delusions