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

Linda’s unraveling escalates when her troubled client Caroline (Danielle Macdonald) emails her a video of Andrea Yates, the Texas mother who drowned her five children in 2001 after developing postpartum psychosis. —Matthew Jacobs, Vulture, 10 Oct. 2025

And those who use it regularly are more prone to depression, psychosis, and memory loss. —Cara Lynn Shultz, PEOPLE, 10 Oct. 2025

She is besieged on all sides—by her in-laws, by social workers, by untreated psychosis—and yet in possession of a terrible freedom. —Jessica Winter, New Yorker, 8 Oct. 2025

Marijuana, specifically edibles, can lead to more mental health issues, like psychosis, anxiety and memory loss. —Enquirer Staff, Cincinnati Enquirer, 8 Oct. 2025

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