名詞 hallucination:

1. illusory perception; a common symptom of severe mental disorder
2. a mistaken or unfounded opinion or idea
   同義詞：delusion
3. an object perceived during a hallucinatory episode

1. Tending to induce hallucinations, delusions, or other symptoms of a psychosis. Used of a drug.
   擬精神幻覺的能引起幻覺、幻想或其它精神病癥狀的，用于藥物
2. A type of schizophrenia, usually starting at puberty, characterized by foolish mannerisms, senseless laughter, delusions, hallucinations, and regressive behavior.
   青春期癡呆一種精神分裂癥，通常始發(fā)于青春期，其特征為舉止癡呆、傻笑、妄想、幻覺以及退化的舉止
3. A temporary state of mental confusion and clouded consciousness resulting from high fever, intoxication, shock, or other causes. It is characterized by anxiety, disorientation, hallucinations, delusions, trembling, and incoherent speech.
   譫妄一種暫時精神混亂和神志不清的狀態(tài)，由高燒、酒醉、休克、震驚或其它原因?qū)е隆Ｆ浒Y狀是：焦慮、迷失方向、發(fā)生幻覺、妄想、顫抖和說胡話
4. A disorder characterized by sudden and uncontrollable, though often brief, attacks of deep sleep, sometimes accompanied by paralysis and hallucinations.
   嗜眠病以突然的和不由自主的，雖然通常短暫的深度睡眠發(fā)作，有時伴隨有麻痹和幻覺為特征的一種紊亂

hal.lu.ci.na.tion

n.（名詞）

False or distorted perception of objects or events with a compelling sense of their reality, usually resulting from a mental disorder or as a response to a drug.
幻覺：對于事物或事件錯誤的或扭曲的看法，同時堅信這些看法的真實性 ，它主要產(chǎn)生于精神錯亂或藥物反應(yīng)
The objects or events so perceived.
由這樣的幻覺產(chǎn)生的形象或事件
A false or mistaken idea; a delusion.
錯誤的想法；一種錯覺

【引伸】
hallu.cina.tional 或
hallu.cina.tive
adj.（形容詞）