cornice
noun /ˈkɔːnɪs/
  /ˈkɔːrnɪs/
 (architecture)- a border around the top of the walls in a room or on the outside walls of a buildingTopics Houses and homesc2Word Originmid 16th cent.: from French corniche, from Italian cornice, perhaps from Latin cornix ‘crow’ (compare with corbel), but influenced by Greek korōnis ‘coping stone’.