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

It may also be used to treat certain other psychotic conditions, such as psychosis arising in Parkinson disease. — Encyclopedia Britannica, 7 Oct. 2026

Defense attorneys had argued that Salazar suffered from past and current episodes of psychosis and was diagnosed with schizophrenia in 2019. — Clara Harter, Los Angeles Times, 1 Oct. 2026

Instead, the defense sought to persuade the jury that the 36-year-old former labor and delivery nurse was not criminally responsible because of mental disease, a rare condition called postpartum psychosis. — Michael Casey, Arkansas Online, 30 Sep. 2026

An employee at one public hospital said there are shortages of key specialized psychiatric medicines to treat bipolar disorders and acute psychosis, and more common medications for anxiety and panic disorders. — ABC News, 30 Sep. 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