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

Keep scrolling for more

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

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 Is Margaret Lockwood hallucinating or was her traveling companion really kidnapped? Rhonda Garelick, The Cut, "Melania’s Recent Behavior Is Right Out of Hitchcock," 11 June 2018 Clark admitted to the drug use and apparently hallucinating while being interviewed by authorities, the sheriff's office said. Everton Bailey Jr., OregonLive.com, "Car thief on LSD thought he was playing ‘Grand Theft Auto’ as he led cops on chase, police say," 4 June 2018 Even in his scenes as Mr. Lies, the tour guide Harper hallucinates, Tidicue stays theatrically grounded. Charles Mcnulty, latimes.com, "For the Berkeley Rep revival of 'Angels in America,' the play is the thing," 29 May 2018 People often hallucinate creepy things — shadowy forms, monsters, and aliens — in their bedrooms. Ilana Strauss, The Cut, "What Is Sleep Paralysis, and How Do You Stop It?," 12 Apr. 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

Share 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 \
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

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 clear from alleged fault or guilt

Get Word of the Day daily email!

Test Your Vocabulary

Difficult Vocab Quiz

  • the-education-of-achilles-eugne-delacroix
  • Which is a synonym of discomfit?
Spell It

Can you spell these 10 commonly misspelled words?

Dictionary Devil

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!