a cultivated plant of the daisy family, with edible leaves that are a usual ingredient of salads. Many varieties of lettuce have been developed with a range of form, texture, and colour 生菜;莴苣
Lactuca sativa, family Compositae 拉丁名Lactuca sativa,菊科 ■used in names of other plants with edible green leaves, e.g. lamb's lettuce, sea lettuce [用于有可食用绿叶的植物名称,如lamb's lettuce, sea lettuce]
语源
Middle English: from Old French letues, laitues, plural of laitue, from Latin lactuca, from lac, lact- 'milk' (because of its milky juice)