psychosis

noun

psy·​cho·​sis sī-ˈkō-səs How to pronounce psychosis (audio)
plural psychoses sī-ˈkō-ˌsēz How to pronounce psychosis (audio)
: 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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
This is mass political psychosis. Howie Carr, Boston Herald, 12 Sep. 2025 And Cherry doesn’t need much to encourage her dormant psychosis. Rafaela Bassili, Vulture, 10 Sep. 2025 At higher doses, kratom can be used as a sedative and potentially cause psychosis. Miami Herald, 8 Sep. 2025 The point that is being made would be that AI psychosis as a moniker provides clarity that AI is an instrumental component in the mental health condition of the client or patient. Lance Eliot, Forbes.com, 7 Sep. 2025 See All Example Sentences for psychosis

Word History

Etymology

New Latin

First Known Use

1847, in the meaning defined above

Time Traveler
The first known use of psychosis was in 1847

Browse Nearby Words

Cite this Entry

“Psychosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/psychosis. Accessed 16 Sep. 2025.

Kids Definition

psychosis

noun
psy·​cho·​sis sī-ˈkō-səs How to pronounce psychosis (audio)
plural psychoses -ˈkō-ˌsēz How to pronounce psychosis (audio)
: 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 How to pronounce psychosis (audio)
plural psychoses -ˌsēz How to pronounce psychosis (audio)
: a serious mental illness (as schizophrenia) characterized by defective or lost contact with reality often with hallucinations or delusions
Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!