hal·​lu·​ci·​nate | \ hə-ˈlü-sə-ˌnāt How to pronounce hallucinate (audio) \
hallucinated; hallucinating

Definition of hallucinate

transitive verb

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

Keep scrolling for more

Other Words from hallucinate

hallucinator \ hə-​ˈlü-​sə-​ˌnā-​tər How to pronounce hallucinator (audio) \ noun

Examples of hallucinate in a Sentence

The patient may hallucinate if she has a fever.

Recent Examples on the Web

In the most shocking moment from the entire episode, after hallucinating for like 45 straight minutes, Archie is found unresponsive by the park rangers who come to try to save him. Carolyn Twersky, Seventeen, ""Riverdale" Midseason Premiere's Most Shocking Moments," 17 Jan. 2019 Archie even hallucinated killing Hiram in the previous episode. Carolyn Twersky, Seventeen, "Who Shot Hiram? A Look at All of the Possible Suspects on "Riverdale"," 24 Jan. 2019 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

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.

See More

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

Keep scrolling for more

Learn More about hallucinate

Statistics for hallucinate

Look-up Popularity

Time Traveler for hallucinate

The first known use of hallucinate was circa 1834

See more words from the same year

Keep scrolling for more

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 How to pronounce hallucinate (audio) \
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

Keep scrolling for more

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

Comments on hallucinate

What made you want to look up hallucinate? Please tell us where you read or heard it (including the quote, if possible).


showing courage and determination

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Name That Thing

Test your visual vocabulary with our 10-question challenge!


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

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