1. Lettuce with long dark-green leaves in a loosely packed elongated head
   "Caesar salad is traditionally made with cos lettuce";
   - cos, romaine, romaine lettuce
    
2. Lettuce with long dark-green spoon-shaped leaves
   "The Caesar salad required fresh cos lettuce";
   - romaine lettuce, Lactuca sativa longifolia

Derived forms: cos lettuces

Type of: lettuce

Part of: genus Lactuca, Lactuca

Encyclopedia: Cos lettuce