An iceberg is a huge chunk of ice that breaks off of a glacier and floats around the ocean. Most of an iceberg is under water and can't be seen; that's how a sneaky iceberg managed to sink the Titanic.

Icebergs exist in the coldest waters on the planet — the largest icebergs ever observed have been in Antarctica. An iceberg is blamed in the famous sinking of the Titanic in 1912, and the disaster inspired a new system for tracking and measuring icebergs. Another kind of iceberg is the lettuce, which is crisp and nearly as pale as an actual iceberg. The colloquial "tip of the iceberg" means the smallest hint of a much larger problem.

Definitions of iceberg
  1. noun
    a large mass of ice floating at sea; usually broken off of a polar glacier
    synonyms: berg
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    a small iceberg or ice floe just large enough to be hazardous for shipping
    type of:
    an object that floats or is capable of floating
    ice mass
    a large mass of ice
  2. noun
    lettuce with crisp tightly packed light-green leaves in a firm head
    iceberg is still the most popular lettuce”
    synonyms: crisphead lettuce, iceberg lettuce
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    type of:
    leaves of any of various plants of Lactuca sativa
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