Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Medical
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

permafrost

play
noun per·ma·frost \ˈpər-mə-ˌfrȯst\

Simple Definition of permafrost

  • : a layer of soil that is always frozen in very cold regions of the world

Source: Merriam-Webster's Learner's Dictionary

Full Definition of permafrost

  1. :  a permanently frozen layer at variable depth below the surface in frigid regions of a planet (as earth)

Origin of permafrost

permanent + frost


First Known Use: 1943

Rhymes with permafrost


Learn More about permafrost


Seen and Heard

What made you want to look up permafrost? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

to eat gluttonously or ravenously

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

image567572573

Which of these is a synonym of unctuous?

maudlin angry oily prompt
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ