- billet doux as a noun:
- 1
billet doux
noun
1 billet doux
Moby thesaurus: Pastoral Epistle, aerogram, air letter, airgraph, bull, chain letter, dead letter, dimissorial, dimissory letter, drop letter, encyclical, fan letter, form letter, letter of credit, letter of introduction, letters credential, letters of marque, letters of request, letters overt, letters patent ... show more.
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