hallucination

 Longman Dictionary of Contemporary English 5++朗文当代英语 5++LDOCE 5++朗文 5++hal·lu·ci·na·tion /həˌluːsəˈneɪʃən/ noun  [countable, uncountable]SEE something which you imagine you can see or hear, but which is not really there, or the experience of this 幻觉，幻象；产生幻觉 The patients suffered hallucinations caused by the drug. 病人受药物影响产生了幻觉。

Examples from the Corpus

hallucination• I knew that what I had seen was a hallucination, but it was so real and frightening.• Stanley said he had flashbacks and hallucinations for several years after he left Edgewood and returned to duty at Fort Knox.• Persinger has suggested that these reports might be hallucinations instilled into the witnesses by the effect of ionising radiation in close proximity.• Jamie lost two and a half stone in the next fortnight, couldn't eat and had hallucinations.• In tests, the drug caused patients to have hallucinations.• Doctors believe the medication was the cause of her hallucinations.• I suffered horrendous hallucinations and flashbacks, and quit using LSD.• This would be the case if indeed the events were involuntary hallucinations.• But the heat was more seen than felt, more hallucination than discomfort.• Close supervision of patients is needed when they have delusions or hallucinations concerning the baby.• Causes stupor, hallucinations, vomiting.• Sometimes the hallucinations associated with small seizures in the temporal lobe have characteristics suggestive of schizophrenic thought, especially paranoia.• As she shoveled, the cries grew too loud to be passed off as wishful hallucinations.

hal·lu·ci·na·tion nounChineseSyllable  

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hallucination
hal‧lu‧ci‧na‧tion /həˌluːsəˈneɪʃən, həˌluːsɪˈneɪʃən/ noun
[uncountable and countable] something which you imagine you can see or hear, but which is not really there, or the experience of this:
    The patients suffered hallucinations caused by the drug.

hal·lu·cin·ationBrE /həˌluːsɪˈneɪʃn/ 🔊NAmE /həˌluːsɪˈneɪʃn/ 🔊 noun [countable, uncountable] the fact of seeming to see or hear sb/sth that is not really there, especially because of illness or drugs 幻觉，幻视，幻听（尤指生病或吸毒所致）◆to have hallucinations产生幻觉◆High temperatures can cause hallucination. 高烧可使人产生幻觉。🔊🔊 [countable] something that is seen or heard when it is not really there 幻视（或幻听）到的东西；幻觉；幻象◆Was the figure real or just a hallucination? 那个人影是真的呢，还是幻象？🔊🔊 HELP Some speakers do not pronounce the 'h' at the beginning of hallucination and use 'an' instead of 'a' before it. This now sounds old-fashioned. 有人说 hallucination 时不发 h 音，前面用 an 而不用 a，现在听起来过时了。