(1) Lettuce with long dark-green leaves in a loosely packed elongated head
WiktionaryText
Etymology
French, from romaine, the feminine of romain ("Roman"), from Latin Romanus
Noun
Lactuca sativa longifolia, a type of lettuce having long crisp leaves forming a slender head. Also known as Romaine lettuce, Cos lettuce, or Cos, after the Greek island of Cos (Kos).
