a large mass of ice floating at sea; usually broken off of a polar glacier
lettuce with crisp tightly packed light-green leaves in a firm head;
"iceberg is still the most popular lettuce"
- Most of the iceberg is under the water.
- The ship was holed by an iceberg.
- Four days after the Titanic set out, a very big iceberg floated towards her.
- He is an iceberg, very difficult to approach.