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luminiferous
luminol
luminosity
luminous
luminous energy
luminous flux
luminous intensity
lumme
lummox
lump (1)
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lunacy

lu·na·cy [ lnəssee ] (plural lu·na·cies)


noun 
Definition:
 
1. thoughtlessness: behavior that is regarded as unintelligent, inconsiderate, or misguided, or an example of it

2. offensive term: an offensive term for any psychiatric disorder that rendered patients legally incompetent and required them to be taken into care. This term has never been used by physicians in medical or psychiatric contexts. ( archaic )

[Mid-16th century. <lunatic]
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