volcano - definition and synonyms

noun [countable] 

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pluralvolcanoes or volcanos
  1. a mountain that forces hot gas, rocks, ash, and lava (=melted rock) into the air through a hole at the top. Some volcanoes are not immediately dangerous because they are not active and have become dormant. Others will never be dangerous again because they are completely extinct

    The volcano last erupted over fifty years ago.

     Synonyms and related words