hal·​lu·​ci·​nate | \ hə-ˈlü-sə-ˌnāt \
hallucinated; hallucinating

Definition of hallucinate

transitive verb

1 : to affect with visions or imaginary perceptions
2 : to perceive or experience as a hallucination

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Other Words from hallucinate

hallucinator \ hə-​ˈlü-​sə-​ˌnā-​tər \ noun

Examples of hallucinate in a Sentence

The patient may hallucinate if she has a fever.

Recent Examples on the Web

Now, again, Hiram could be celebrating his victory by getting high and hallucinating on fizzle rocks, but that just doesn’t seem his style. Emma Dibdin, Harper's BAZAAR, "Riverdale's Winter Finale Finally Solves the Gargoyle King Mystery," 13 Dec. 2018 Inmates who smoked the drug Monday started vomiting, hallucinating and having convulsions. Fox News, "6 Florida inmates ill after smoking smuggled marijuana," 13 June 2018 In severe manic episodes, an individual might hallucinate and experience psychosis. Jacqueline Andriakos, SELF, "This Is What a Bipolar Manic Episode Feels Like," 7 Dec. 2018 According to the National Health Service, when administered properly, nitrous oxide has several legitimate uses, but when abused can make people feel euphoric and relaxed, or lead others to hallucinate. Alexandria Hein, Fox News, "Woman claims sucking balloon air left her paralyzed," 24 Aug. 2018 Angela Wright, 25, was rushed to a local hospital in June, unable to walk and hallucinating, after she was reportedly bitten in her apartment, Fox News previously reported. Madeline Farber, Fox News, "Tennessee woman bitten by brown recluse spider in alleged infested apartment to move," 12 July 2018 Witnesses told British media outlets that, before losing consciousness, Rowley and Sturgess were frothing at the mouth, hallucinating, and incoherent. Beth Mole, Ars Technica, "Second Novichok poisoning in Britain raises alarm, questions over contamination," 5 July 2018 Alongside Jeff Bridges's depressed former DJ, Williams plays a homeless man reeling from the death of his wife, obsessed with finding the Holy Grail and hallucinating visions of a red knight. Kelly Lawler, USA TODAY, "The 5 best Robin Williams movies to binge-watch this weekend," 13 July 2018 Some people hallucinate and have even become psychotic. Carrie Feibel, Washington Post, "With The Rise Of Legal Weed, Drug Education Moves From ‘Don’t’ to ‘Delay’," 7 June 2018

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

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First Known Use of hallucinate

circa 1834, in the meaning defined at transitive sense 1

History and Etymology for hallucinate

Latin hallucinatus, past participle of hallucinari, allucinari to prate, dream, modification of Greek alyein to be distressed, to wander

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Last Updated

23 Jan 2019

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Time Traveler for hallucinate

The first known use of hallucinate was circa 1834

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More Definitions for hallucinate



English Language Learners Definition of hallucinate

: to see or sense something or someone that is not really there : to have hallucinations


hal·​lu·​ci·​nate | \ hə-ˈlüs-ᵊn-ˌāt \
hallucinated; hallucinating

Medical Definition of hallucinate

transitive verb

1 : to affect with visions or imaginary perceptions the patient is not hallucinated
2 : to perceive or experience as a hallucination may hallucinate monsters or attackers— M. J. Horowitz

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More from Merriam-Webster on hallucinate

Rhyming Dictionary: Words that rhyme with hallucinate

Thesaurus: All synonyms and antonyms for hallucinate

Spanish Central: Translation of hallucinate

Nglish: Translation of hallucinate for Spanish Speakers

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