This is the 4160th most frequent French word.
cuir
Leather.
In this sentence, 'cuir' refers to the leather material used as the composition of the item.
Le sac est fait en cuir véritable.
The bag is made of genuine leather.
Here, 'cuir' indicates the type of material (leather) that the shoemaker works with.
Le cordonnier répare des articles en cuir.
The shoemaker repairs leather items.
The word 'cuir' designates the leather material used to make the jacket.