lettuce -
The leaves of the lettuce plant, eaten as a vegetable; as a dish often mixed with other ingredients, dressing etc.
lettuce -
Folding money, also called cabbage, due to the green color of both US currency and the vegetables.
Wikipedia
Lettuce (Lactuca sativa) is a temperate annual or biennial plant of the daisy family Asteraceae. It is most often grown as a leaf vegetable. In many countries, it is typically eaten cold, raw, in salads, sandwiches, hamburgers, tacos, and in many other dishes.
OmegaWiki Dictionary
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lettuce A green, leafy vegetable (Lactuca sativa) commonly eaten in salads, burgers and tacos.