Wiktionary
croque-monsieur
n. A hot grilled ham and cheese sandwich, originating from France.
Wikipedia
Croque-monsieur
The croque monsieur (; French for "gentleman crunch") is a baked or fried boiled ham and cheese sandwich. The dish originated in French cafés and bars as a quick snack. A croque madame is a version of the dish topped with a fried egg.
The name is based on the verb croquer ("to bite") and the word monsieur ("mister"). The sandwich's first recorded appearance on a Parisian café menu was in 1910. Its earliest mention in literature appears to be in volume two of Proust's In Search of Lost Time in 1918.
Usage examples of "croque-monsieur".
Lunch seemed always to consist of sandwich au jambon or croque-monsieur.