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[huh-loo-suh-ney-shuh n] /həˌlu səˈneɪ ʃən/

a sensory experience of something that does not exist outside the mind, caused by various physical and mental disorders, or by reaction to certain toxic substances, and usually manifested as visual or auditory images.
the sensation caused by a hallucinatory condition or the object or scene visualized.
a false notion, belief, or impression; illusion; delusion.
the alleged perception of an object when no object is present, occurring under hypnosis, in some mental disorders, etc

in the pathological/psychological sense of “seeing or hearing something which is not there,” 1640s, from Latin hallucinationem (nominative hallucinatio), from past participle stem of hallucinari (see hallucinate). Hallucination is distinct from illusion in not necessarily involving a false belief. Related: Hallucinations.

hallucination hal·lu·ci·na·tion (hə-lōō’sə-nā’shən)

hal·lu’ci·nate’ v.
hal·lu’ci·na’tion·al or hal·lu’ci·na’tive adj.

A false perception that appears to be real, as when, for example, a man dying of thirst in a desert thinks that he sees a lake. (See also delusion.)


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  • Hallucinatory

    [huh-loo-suh-nuh-tawr-ee, -tohr-ee] /həˈlu sə nəˌtɔr i, -ˌtoʊr i/ adjective 1. pertaining to or characterized by hallucination: hallucinatory visions. adj. 1830, from hallucinat-, past participle stem of Latin hallucinari (see hallucinate) + -ory. hallucinatory hal·lu·ci·na·to·ry (hə-lōō’sə-nə-tôr’ē) adj.

  • Hallucinogen

    [huh-loo-suh-nuh-juh n] /həˈlu sə nə dʒən/ noun 1. a substance that produces . /həˈluːsɪnəˌdʒɛn/ noun 1. any drug, such as LSD or mescaline, that induces hallucinations n. “drug which induces hallucinations,” 1954, from stem of hallucination + -gen. hallucinogen hal·lu·ci·no·gen (hə-lōō’sə-nə-jən) n. A substance that induces hallucination. hal·lu’cin·o·gen’ic (-jěn’ĭk) adj. hallucinogen (hə-l’sə-nə-jən) A drug or […]

  • Hallucinogenic

    [huh-loo-suh-nuh-jen-ik] /həˌlu sə nəˈdʒɛn ɪk/ adjective 1. producing hallucinations: a hallucinogenic drug. 2. of, relating to, or constituting a or . noun 3. a hallucinogenic substance. /həˌluːsɪnəʊˈdʒɛnɪk/ adjective 1. (of drugs, plants, substances, etc) inducing hallucinations 2. having qualities suggestive of hallucination or hallucinogens: strange, hallucinogenic scenes adj. 1952, from hallucinogen + -ic.

  • Hallucinosis

    [huh-loo-suh-noh-sis] /həˌlu səˈnoʊ sɪs/ noun, Psychiatry. 1. a mental state characterized by repeated . /həˌluːsɪˈnəʊsɪs/ noun 1. (psychiatry) a mental disorder the symptom of which is hallucinations, commonly associated with the ingestion of alcohol or other drugs hallucinosis hal·lu·ci·no·sis (hə-lōō’sə-nō’sĭs) n. An abnormal condition or a mental state that is characterized by hallucination.

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