Definition of billet-doux in English:

billet-doux

Syllabification: bil·let-doux
Pronunciation: /ˌbilāˈdo͞o, ˌbēyāˈdo͞o
 
/

noun (plural billets-doux pronounced same or /-ˈdo͞oz/)

dated or humorous
A love letter.
More example sentences
  • In the last four years alone, no fewer than three auctions have featured billets-doux and other letters written by the Duke of Windsor when he held the titles Prince of Wales and King Edward VIII.
  • As she seems easily fooled, why not send yourself sheaves of valentines and other billets-doux?
  • And so he returns to the paparazzi and the predictable billets-doux slipped under the door by self-justifying journalists who have hypocrisy tattooed on their foreheads.

Origin

late 17th century: French, literally 'sweet note'.

Definition of billet-doux in:

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