(, "o-e entrelacé" or "o et e collés/liés") This ligature is a mandatory contraction of in certain words. Some of these are native French words, with the pronunciation or , e.g., "chœur" "choir" , "cœur" "heart" , "mœurs" "moods (related to moral)" , "nœud" "knot" , "sœur" "sister" , "œuf" "egg" , "œuvre" "work (of art)" , "vœu" "vow" . It usually appears in the combination "œu"; "œil" "eye" is an exception. Many of these words were originally written with the digraph "eu"; the "o" in the ligature represents a sometimes artificial attempt to imitate the Latin spelling: Latin "bovem" > Old French "buef"/"beuf" > Modern French "bœuf".