hal·​lu·​ci·​no·​sis | \ hə-ˌlü-sə-ˈnō-səs How to pronounce hallucinosis (audio) \

Definition of hallucinosis

: a pathological mental state characterized by hallucinations

Examples of hallucinosis in a Sentence

Recent Examples on the Web Boes was working with a patient who had a rare disorder called peduncular hallucinosis, in which damage to the thalamus, a structure at the center of the brain, causes visual hallucinations. Grace Huckins, Wired, 17 Aug. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'hallucinosis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of hallucinosis

1905, in the meaning defined above

History and Etymology for hallucinosis

New Latin

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Time Traveler for hallucinosis

Time Traveler

The first known use of hallucinosis was in 1905

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Cite this Entry

“Hallucinosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hallucinosis. Accessed 8 Dec. 2021.

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More Definitions for hallucinosis


hal·​lu·​ci·​no·​sis | \ hə-ˌlüs-ᵊn-ˈō-səs How to pronounce hallucinosis (audio) \
plural hallucinoses\ -​ˌsēz How to pronounce hallucinosis (audio) \

Medical Definition of hallucinosis

: a pathological mental state characterized by hallucinations

More from Merriam-Webster on hallucinosis

Thesaurus: All synonyms and antonyms for hallucinosis


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