What does "cordon" mean?

Additional senses

1. 2.(Fort.) The coping of the scarp wall, which projects beyong the face of the wall a few inches.
2. 3.(Mil.) A line or series of sentinels, or of military posts, inclosing or guarding any place or thing.
3. 4.A rich and ornamental lace or string, used to secure a mantle in some costumes of state. Cordon bleu (kd" bl Etym: [F., blue cordon], a first-rate cook, or one worthy to be the cook of the cordons bleus, or Knights of the Holy Ghost, famous for their good dinners. -- Cordon sanitaire (kd" s Etym: [F., sanitary cordon], a line of troops or military posts around a district infected with disease, to cut off communication, and thus prevent the disease from spreading.