hal·​lu·​ci·​no·​gen hə-ˈlü-sə-nə-jən How to pronounce hallucinogen (audio)
: a substance that induces hallucinations
hallucinogenic adjective or noun

Example Sentences

Recent Examples on the Web Johns Hopkins Medicine, Nayak said, is researching whether the hallucinogen can help people stop smoking, as well as anorexia nervosa, chronic lyme disease and Alzheimer's. Erika Edwards, NBC News, 2 Nov. 2022 At doses of 200 micrograms, considered a high psychoactive dose, according to Garcia-Romeu, the oral hallucinogen has been found to have a therapeutic benefit for reducing anxiety. Jodi Helmer, Fortune, 27 Sep. 2022 Two-thirds of the study’s adult participants who were given a 25 mg dose of the active hallucinogen recorded a significant improvement in their depression within as little as three weeks, the researchers found. Leo Sands, Washington Post, 3 Nov. 2022 The results have been so promising that Garcia-Romeu believes Food and Drug Administration approval to use the hallucinogen MDMA, or ecstasy, to treat PTSD could come as soon as 2023. Jodi Helmer, Fortune, 27 Sep. 2022 But 8% of young adults reported past-year hallucinogen use, an increase from 5% in 2016 and 3% in 2011. Cliff Pinckard, cleveland, 23 Aug. 2022 In 1968, the United States outlawed LSD possession, categorizing the hallucinogen as a Schedule 1 drug. Emma Yasinski, Smithsonian Magazine, 3 May 2022 They players were given a wild assortment of ridiculous tasks that served no real purpose except to trick viewers into thinking that their TV dinners had been laced with some sort of powerful hallucinogen. Dalton Ross, EW.com, 20 Apr. 2022 Psychedelic plants have been part of religious rituals for thousands of years, and along with the synthetic hallucinogen LSD, became a fixture of the American counterculture in the 1960s. John Keilman, chicagotribune.com, 28 Mar. 2022 See More

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

Word History


hallucination + -o- + -gen

First Known Use

1954, in the meaning defined above

Time Traveler
The first known use of hallucinogen was in 1954

Dictionary Entries Near hallucinogen

Cite this Entry

“Hallucinogen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/hallucinogen. Accessed 5 Dec. 2022.

Kids Definition



hal·​lu·​ci·​no·​gen hə-ˈlü-sə-nə-jən How to pronounce hallucinogen (audio)
: a drug that causes hallucinations
hallucinogenic adjective

Medical Definition



hal·​lu·​ci·​no·​gen hə-ˈlüs-ᵊn-ə-jən How to pronounce hallucinogen (audio)
: a substance and especially a drug that induces hallucinations

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