Definition of lettuce noun from the Oxford Advanced American Dictionary

 

lettuce

 noun
noun
NAmE//ˈlɛt̮əs//
 
[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.
See the Oxford Advanced Learner's Dictionary entry: lettuce