romaine (adj.)

type of lettuce, 1876, from French romaine (in laitue romaine, literally "Roman lettuce"), from fem. of Old French romain "Roman," from Latin Romanus (see Roman). Perhaps so called because of the lettuce's introduction into France (by Bureau de la Rivière, chamberlain of Charles V and VI) at the time of the Avignon papacy (1309-77).

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Definitions of romaine from WordNet

romaine (n.)
lettuce with long dark-green leaves in a loosely packed elongated head;
Synonyms: cos / cos lettuce / romaine lettuce