| elucidation | (noun) an interpretation that removes obstacles to understanding | Synonyms: clarification, illumination |
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| (noun) an act of explaining that serves to clear up and cast light on | - |
| glucinium | (noun) a light strong brittle grey toxic bivalent metallic element | Synonyms: atomic number 4, Be, beryllium |
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| hallucination | (noun) a mistaken or unfounded opinion or idea | Synonyms: delusion |
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| (noun) an object perceived during a hallucinatory episode | - |
| (noun) illusory perception; a common symptom of severe mental disorder | - |
| hallucinogen | (noun) a psychoactive drug that induces hallucinations or altered sensory experiences | Synonyms: hallucinogenic drug, psychedelic drug, psychodelic drug |
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| hallucinosis | (noun) a mental state in which the person has continual hallucinations | - |
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| lucidity | (noun) free from obscurity and easy to understand; the comprehensibility of clear expression | Synonyms: clarity, clearness, limpidity, lucidness, pellucidity |
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| (noun) a lucid state of mind; not confused | - |
| lucidness | (noun) free from obscurity and easy to understand; the comprehensibility of clear expression | Synonyms: clarity, clearness, limpidity, lucidity, pellucidity |
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| lucifer | (noun) lighter consisting of a thin piece of wood or cardboard tipped with combustible chemical; ignites with friction | Synonyms: friction match, match |
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| luciferin | (noun) pigment occurring in luminescent organisms (as fireflies); emits heatless light when undergoing oxidation | - |
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| pellucidity | (noun) passing light without diffusion or distortion | Synonyms: limpidity, pellucidness |
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| (noun) free from obscurity and easy to understand; the comprehensibility of clear expression | Synonyms: clarity, clearness, limpidity, lucidity, lucidness |
| pellucidness | (noun) passing light without diffusion or distortion | Synonyms: limpidity, pellucidity |
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| pollucite | (noun) a rare mineral that is an important source of cesium | - |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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