Noun romaine lettuce has 2 senses
  1. cos lettuce, romaine lettuce, Lactuca sativa longifolia - lettuce with long dark-green spoon-shaped leaves
    --1 is a kind of lettuce
    --1 is a member of Lactuca, genus Lactuca
  2. cos, cos lettuce, romaine, romaine lettuce - lettuce with long dark-green leaves in a loosely packed elongated head
    --2 is a kind of lettuce
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