stem lettuce(n = noun.plant) celtuce, lactuca sativa asparagina - lettuce valued especially for its edible stems;
is a kind of lettuce
has parts: celtuce

bibb lettuce, blue stem, boston lettuce, brain stem, butterhead lettuce, common lettuce, cos lettuce, crisphead lettuce, frog's lettuce, garden lettuce, head lettuce, hematopoeitic stem cell, iceberg lettuce, indian lettuce, lamb's lettuce, leaf lettuce, lettuce, loose-leaf lettuce, malheur wire lettuce, miner's lettuce, onion stem, prickly lettuce, romaine lettuce, sea lettuce, stem, stem blight, stem canker, stem cell, stem ginger, stem turn, stem vowel, water lettuce, white lettuce