noun
An edible plant, Lactuca sativa and its close relatives, having a head of green or purple leaves.
(uncountable, vegetable) The leaves of the lettuce plant, eaten as a vegetable; as a dish often mixed with other ingredients, dressing etc.
(uncountable, US, slang) United States paper currency; dollars.
A strong yellow-green color, like that of lettuce (also called lettuce green).
(uncountable, slang) Marijuana.
(uncountable, slang) Long, curly hair, as worn by followers of bro culture.