Definitions for iceberg lettuce
Random House Webster's College Dictionary
a variety of lettuce having a cabbagelike head of crisp leaves.
Origin of iceberg lettuce:
crisphead lettuce, iceberg lettuce, iceberg(noun)
lettuce with crisp tightly packed light-green leaves in a firm head
"iceberg is still the most popular lettuce"
A lettuce cultivar noted for its crunchiness; the most familiar of all lettuces sold in the United States.
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