Romaine is a lettuce with long, stiff leaves that stand up in a head, not a round soft ball. The leaves are crunchy, and near the thick white stem they can taste a little bitter — that is the bitter taste dictionaries mention, though the green parts are milder. Cooks like it in Caesar salad because it stays crisp under dressing. In British English people often call the same plant cos lettuce. It is ordinary supermarket food, not a fancy word.

蘿蔓生菜（台灣常簡稱「蘿蔓」；中國大陸多說「羅馬生菜」）