romaine

n.
A cultivar of lettuce (Lactuca sativa) having a slender head of oblong or obovate leaves with broad midribs. Also called cos, cos lettuce.

[French, from feminine of Romain, Roman, from Old French, from Latin Rōmānus, from Rōma, Rome.]

Long-leafed variety of lettuce, known in the USA as romaine.

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The noun has one meaning:

Meaning #1: lettuce with long dark-green leaves in a loosely packed elongated head
  Synonyms: cos, cos lettuce, romaine lettuce

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