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halls of ivy
Hallstatt or Hallstattian
hallucinogenic drug

Hallucination definitions

Webster's 1828 Dictionary

HALLUCINA'TION, n. [L.hallucinatio, from hallucinor, to blunder.]
1. Error; blunder; mistake. [Little used.]
2. In medicine, faulty sense [dysaesthesia,] or erroneous imagination. Hallucinations of the senses, arise from some defect in the organs of sense, or from some unusual circumstances attending the object, as when it is seen by moonlight; and they are sometimes symptoms of general disease, as in fevers. Maniacal hallucinations arise from some imaginary or mistaken idea. Similar hallucinations occur in revery.

WordNet (r) 3.0 (2005)

1: illusory perception; a common symptom of severe mental disorder
2: a mistaken or unfounded opinion or idea; "he has delusions of competence"; "his dreams of vast wealth are a hallucination" [syn: delusion, hallucination]
3: an object perceived during a hallucinatory episode; "he refused to believe that the angel was a hallucination"

Merriam Webster's

noun Date: 1629 1. a. perception of objects with no reality usually arising from disorder of the nervous system or in response to drugs (as LSD) b. the object so perceived 2. an unfounded or mistaken impression or notion ; delusion Synonyms: see delusion

Oxford Reference Dictionary

n. the apparent or alleged perception of an object not actually present. Derivatives: hallucinatory adj. Etymology: L hallucinatio (as HALLUCINATE)

Webster's 1913 Dictionary

Hallucination Hal*lu`ci*na"tion, n. [L. hallucinatio: cf. F. hallucination.] 1. The act of hallucinating; a wandering of the mind; error; mistake; a blunder. This must have been the hallucination of the transcriber. --Addison.

Collin's Cobuild Dictionary

(hallucinations) A hallucination is the experience of seeing something that is not really there because you are ill or have taken a drug. The drug induces hallucinations at high doses... N-VAR

Soule's Dictionary of English Synonyms

n. 1. Error, blunder, mistake, fallacy. 2. Illusion, delusion, self-deception, phantasm, aberration. 3. (Med.) Illusion of sense, sensible delusion, subjective perception.

Moby Thesaurus

aberration, agnosia, apparition, bamboozlement, befooling, block, blocking, bluffing, brainchild, bubble, calculated deception, chimera, circumvention, conning, deceiving, deception, deceptiveness, defrauding, delirium, delirium tremens, delusion, delusion of persecution, delusiveness, disorientation, dream, dupery, eidolon, enmeshment, ensnarement, entanglement, entrapment, fallaciousness, fallacy, falseness, fancy, fantasque, fantasy, fata morgana, fiction, figment, flight of ideas, flimflam, flimflammery, fond illusion, fooling, ghost, hallucinosis, hoodwinking, idle fancy, illusion, imagery, imagination, imagining, insubstantial image, invention, kidding, maggot, make-believe, mental block, mental confusion, mind-expansion, mirage, myth, nihilism, nihilistic delusion, outwitting, overreaching, paralogia, phantasm, phantom, psychological block, putting on, romance, self-deception, sick fancy, snow job, song and dance, spoofery, spoofing, subterfuge, swindling, thick-coming fancies, trickiness, tricking, trip, tripping, vapor, victimization, vision, whim, whimsy, wildest dreams, willful misconception, wishful thinking, wraith


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