| lactuca | (n) an herb with milky juice: lettuce; prickly lettuce, Syn. genus Lactuca |
| celtuce | (n) lettuce valued especially for its edible stems, Syn. stem lettuce, Lactuca sativa asparagina |
| cos lettuce | (n) lettuce with long dark-green spoon-shaped leaves, Syn. romaine lettuce, Lactuca sativa longifolia |
| garden lettuce | (n) annual or perennial garden plant having succulent leaves used in salads; widely grown, Syn. Lactuca sativa, common lettuce |
| head lettuce | (n) distinguished by leaves arranged in a dense rosette that develop into a compact ball, Syn. Lactuca sativa capitata |
| leaf lettuce | (n) distinguished by leaves having curled or incised leaves forming a loose rosette that does not develop into a compact head, Syn. Lactuca sativa crispa |
| prickly lettuce | (n) European annual wild lettuce having prickly stems; a troublesome weed in parts of United States, Syn. Lactuca scariola, horse thistle, Lactuca serriola |