chemin de ronde
/ʃəˌman də ˈrɒnd/ /ʃəˌmã də ˈrɒnd/(also chemin de rondes, chemin des rondes) Architecture
noun
Chiefly in France: a walkway or passage which runs behind the parapet of castle, town wall, etc., allowing guards or troops to move around the upper levels of a fortification with some degree of protection.
Origin
Late 17th century. From French chemin de ronde, chemin des rondes from chemin way, path + de + ronde.