from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A cultivar of lettuce (Lactuca sativa) having a slender head of oblong or obovate leaves with broad midribs. Also called cos1, cos lettuce.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. 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).
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. lettuce with long dark-green leaves in a loosely packed elongated head
French, from feminine of Romain, Roman, from Old French, from Latin Rōmānus, from Rōma, Rome.(American Heritage® Dictionary of the English Language, Fourth Edition)
French, from romaine, the feminine of romain ("Roman"), from Latin Romanus (Wiktionary)