What is the meaning of Iceberg?

The seaward end of a glacier.

A huge mass of ocean-floating ice which has broken off a glacier or ice shelf

An aloof person.

An impending disastrous event whose adverse effects are only beginning to show, in reference to one-tenth of the volume of an iceberg being visible above water.

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iceberg

iceberg (huge mass of floating ice)

iceberg

Source: wiktionary.org