[roh-meyn, ruh-] 
| Also called romaine lettuce, cos, cos lettuce. a variety of lettuce, Lactuca sativa longifolia, having a cylindrical head of long, relatively loose leaves. |
| ro·maine (rō-mān') n. A cultivar of lettuce (Lactuca sativa) having a slender head of oblong or obovate leaves with broad midribs. Also called cos1, cos lettuce. [French, from feminine of Romain, Roman, from Old French, from Latin Rōmānus, from Rōma, Rome.] |
