lettuce with crisp tightly packed light-green leaves in a firm head
"iceberg is still the most popular lettuce"
The seaward end of a glacier.
"As the iceberg drifted away from the coast, sailors realized they were watching the seaward end of a massive glacier breaking free into the ocean."
The word iceberg comes from Dutch ijsberg, which combines ijs for "ice" and berg for "mountain." It was originally used by sailors to describe distant glaciers before referring to the floating ice chunks that break off from them.