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Definition of "permafrost" [permafrost]

  • Permanently frozen subsoil, occurring throughout the Polar Regions and locally in perennially frigid areas. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "permafrost" in a sentence
  • "The temperature in the permafrost is rising in Alaska, northwest Canada, Siberia and Northern Europe."
  • "Beyond affecting the humans and wildlife that call the area home, the Arctic's warmer temperatures and decreases in permafrost, snow cover, glaciers and sea ice also have wide-ranging consequences for the physical and biological systems in other parts of the world."
  • ""Beyond affecting the humans and wildlife that call the area home, the Arctic's warmer temperatures and decreases in permafrost, snow cover, glaciers and sea ice also have wide-ranging consequences for the physical and biological systems in other parts of the world," NOAA Administrator Jane Lubchenco said in a statement."