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 There are people with animal-head masks and the team hallucinates about their pasts. Mary Ann Grossmann, Twin Cities, "Literary Pick of the Week: Impending horror in Benjamin Percy’s short stories," 19 Oct. 2019 The combination of dehydration, hunger, exhaustion, and her fear of the dark causes Trisha to hallucinate. Christian Holub, EW.com, "Another Stephen King novel is getting made into a movie," 21 Aug. 2019 Alongside Jeff Bridges' 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 remember him by," 11 Aug. 2019 That could be dangerous for consumers looking to relax, not hallucinate. San Diego Union-Tribune, "How much pot in that brownie? Chocolate can throw off tests," 26 Aug. 2019 As her fever rose higher and higher, Marsha Engle-Reinecke began to hallucinate. Nara Schoenberg, chicagotribune.com, "As vaccine opposition grows, survivors of measles, mumps and rubella warn of lifelong effects, including vision loss, deafness: ‘How different my life would have been’," 19 July 2019 What keeps stochastic Turing patterns from constantly forming and causing us to constantly hallucinate? Jennifer Ouellette, Quanta Magazine, "A Math Theory for Why People Hallucinate," 30 July 2018 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

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

Last Updated

13 Nov 2019

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


How to pronounce hallucinate (audio)

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

Thesaurus: All synonyms and antonyms for hallucinate

Rhyming Dictionary: Words that rhyme with 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).


to engage in dissolute behavior

Get Word of the Day daily email!

Test Your Vocabulary

Pass the Little Ribbons: A Pasta Word Quiz

  • rotelle pasta
  • Match the pasta to its meaning in English: Rotelle
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

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!