'Billet-doux' definitions:

Definition of 'Billet-doux'

From: GCIDE
  • Billet-doux \Bil`let-doux"\ (b[i^]l`l[asl]*d[=oo]"), n.; pl. Billets-doux (b[i^]l`l[asl]*d[=oo]z"). [F. billet note + doux sweet, L. dulcis.] A love letter or note. [1913 Webster]
  • A lover chanting out a billet-doux. --Spectator. [1913 Webster]