WEB羊莴苣. lamb's lettuce uk / ˈlæmz ˌlet.ɪs/ us / ˌlæmz ˈlet̬.ɪs/ noun mainly UK. a plant whose small, round, green leaves are used in salads: The typical mixed green salad includes frisee, lamb's lettuce, baby oak leaf, rocket, and radicchio. 典型的混合蔬菜沙拉包括苦苣、羊莴苣、小橡树叶、芝麻菜和菊苣。.