noun

1. An edible plant, Lactuca sativa and its close relatives, having a head of green and/or purple leaves.

2. The leaves of the lettuce plant, eaten as a vegetable; as a dish often mixed with other ingredients, dressing etc.

   “I’ll have a ham sandwich with lettuce and tomato.”

3. United States paper currency; dollars.

   “Twelve dollars an hour? That's a lot of lettuce!”

Synonyms: cabbage, greenback, sleepwort