Definition of lettuce noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈletɪs//
; NAmE NAmE//ˈletɪs//
[uncountable, countable]
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a plant with large green leaves that are eaten raw, especially in salad. There are many types of lettuce. a bacon, lettuce and tomato sandwich Buy a lettuce and some tomatoes. You need one whole head of lettuce for this salad. Word OriginMiddle English: from Old French letues, laitues, plural of laitue, from Latin lactuca, from lac, lact- ‘milk’ (because of its milky juice).
See the Oxford Advanced American Dictionary entry: lettuce