Definition of billet-doux noun from the Oxford Advanced Learner's Dictionary

 

billet-doux

 noun
noun
BrE BrE//ˌbɪleɪ ˈduː//
 
; NAmE NAmE//ˌbɪleɪ ˈduː//
 
(pl. billets-doux
BrE BrE//ˌbɪleɪ ˈduːz//
 
; NAmE NAmE//ˌbɪleɪ ˈduːz//
 
)
(from French, humorous or literary)
 
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a love letter Word Origin late 17th cent.: French, literally ‘sweet note’.
See the Oxford Advanced American Dictionary entry: billet-doux