What is the meaning of Lettuce?

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

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

United States paper currency; dollars.

A strong yellow-green colour, like that of lettuce (also called lettuce green).

weed or marijuana

long hair, as worn by an exemplar of bro culture

Source: wiktionary.org