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[huh-loo-suh-neyt] /həˈlu səˌneɪt/
verb (used without object), hallucinated, hallucinating.
to have hallucinations.
verb (used with object), hallucinated, hallucinating.
to affect with hallucinations.
1595-1605; < Latin hallūcinātus, past participle of (h)allūcināri to wander in mind; see -ate1
Related forms
hallucinator, noun
nonhallucinated, adjective
unhallucinated, adjective
unhallucinating, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for hallucinating
  • He began hallucinating and, for reasons unknown, publicly parading around in the buff.
  • Why don't they ask people if they are distressed at the idea of hallucinating.
  • The prospect of a delusional hallucinating mate is not a pleasant one.
  • His longing becomes so acute that he begins hallucinating its presence in the streets.
  • But weeks later, when the parasites enter the brain, patients begin hallucinating or acting wildly.
British Dictionary definitions for hallucinating


(intransitive) to experience hallucinations
Derived Forms
hallucinator, noun
Word Origin
C17: from Latin ālūcinārī to wander in mind; compare Greek aluein to be distraught
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for hallucinating



c.1600, "deceive," from Latin alucinatus, later hallucinatus, past participle of alucinari "wander (in the mind), dream; talk unreasonably, ramble in thought," probably from Greek alyein, Attic halyein "be distraught," probably related to alaomai "wander about" [Barnhart, Klein]. The Latin ending probably was influenced by vaticinari "to prophecy," also "to rave." Sense of "to have illusions" is from 1650s. Occasionally used 19c. in transitive senses, "to cause hallucination." Related: Hallucinated; hallucinating.

Online Etymology Dictionary, © 2010 Douglas Harper
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