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.
There is some history of psychosis, so that’s to be determined. Landon Mion, FOXNews.com, 27 June 2025 For Jerry Kane, the sovereign citizen movement is something between a political philosophy and a burgeoning psychosis. David Ehrlich, IndieWire, 10 June 2025 In their new thriller Die, My Love, Jennifer Lawrence and Robert Pattinson play new parents grappling with Lawrence’s character’s severe postpartum depression and psychosis (a rare and very serious condition that can come on suddenly, but is reversible with treatment). Elizabeth Logan, Glamour, 19 May 2025 Will entered a state of psychosis, and to quench his thirst accidentally grabbed a jar of protein powder. Tiney Ricciardi, Denver Post, 13 May 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 9 Jul. 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
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