billet-doux

n (pl billets-doux/ 9bIleI5du:z; 9bIle`duz/) (joc 谑) love-letter 情书.

bilaterally, bilberry, bile, bile-duct, bilge, bilharzia, bilingual, bilingually, bilious, biliousness, bilk, bill, bill of exchange, bill of fare, bill of lading, bill of rights, bill of sale, billabong, billboard, billet, billfold, billhook, billiard-, billiards, billion, billow, billowy, billposter (also billsticker), billy, billy-goat, billy-oh (also billy-o), biltong, bimetallic, bimetallism, bimonthly, bin, binary, binary digit, binary notation system, binary star,