/?kɑ?s ?let?.?s/(also mainlyUSromaine)atypeoflettuce(=greensaladvegetable)withlong,narrowleaves直立莴苣YinYang/E+/GettyImagesSMART Vocabulary: related words and phrasesTypes of vegetable
alfalfa
allium
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Chinese leaves
collard
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corn salad
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See more results ?(Definition ofcos lettucefrom theCambridge Advanced Learner's Dictionary & Thesaurus? Cambridge University Press)Examples from literature
The cos lettuce is an upright-growing type much esteemed in Europe, but less grown here.
The radical leaves are over a foot long, stem leaves much smaller, very dark holly green of leather-like substance, the edges very unevenly shaped, the general form of the leaf being something like the cos lettuce.