Definition of negligee noun from the Oxford Advanced Learner's Dictionary

 

negligee

 noun
(also negligée)noun
BrE BrE//ˈneɡlɪʒeɪ//
 
; NAmE NAmE//ˌneɡlɪˈʒeɪ//
 
 
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a woman’s dressing gown made of very thin cloth Word Origin mid 18th cent. (denoting a kind of loose gown worn by women): from French, literally ‘given little thought or attention’, feminine past participle of négliger ‘to neglect’.
See the Oxford Advanced American Dictionary entry: negligee