This is the 6859th most frequent French word.
libanais
Lebanese.
Here, "libanais" is used as an adjective to describe the nationality of the restaurateur.
Je connais un restaurateur libanais qui prépare des plats délicieux.
I know a Lebanese restaurateur who prepares delicious dishes.
In this sentence, "Libanais" functions as a noun referring to a person from Lebanon.
Le Libanais a gagné une médaille aux Jeux Olympiques.
The Lebanese person won a medal at the Olympic Games.
In this example, "libanais" again operates as an adjective, but it is describing the origin of the wine.