The word for "wall" in French is "le mur", but it's important to note that "mur" is actually a masculine noun. However, the definite article "le" makes it sound feminine.
This is because the definite article "le" is used for both masculine and feminine nouns in the singular, while the definite article "la" is only used for feminine nouns.
Therefore, even though "mur" is masculine, the usage of "le" makes "le mur" seem feminine.