lettuce /ˈlɛt.ɪs/ noun6 •An edible plant, Lactuca sativa and its close relatives, having a head of green or purple leaves. •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. •A strong yellow-green color, like that of lettuce (also called lettuce green). •(US, slang) United States paper currency; dollars.Twenty dollars an hour? That's a lot of lettuce! •(slang) Marijuana. •(slang) Long, curly hair, as worn by followers of bro culture. formslettuces