boston lettuce(n = noun.food) - lettuce with relatively soft leaves;
is a kind of butterhead lettuce
bibb lettuce, boston, boston baked beans, boston brown bread, boston bull, boston cream pie, boston fern, boston harbor, boston ivy, boston rocker, boston tea party, boston terrier, butterhead lettuce, common lettuce, cos lettuce, crisphead lettuce, frog's lettuce, garden lettuce, head lettuce, iceberg lettuce, indian lettuce, lamb's lettuce, leaf lettuce, lettuce, loose-leaf lettuce, malheur wire lettuce, miner's lettuce, prickly lettuce, romaine lettuce, sea lettuce, stem lettuce, water lettuce, white lettuce