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Meaning of pingo

pin•go

Pronunciation: (ping'gō), [key]
— pl. -gos.
  1. a hill of soil-covered ice pushed up by hydrostatic pressure in an area of permafrost.
  2. a hill of similar origin remaining after the melting of permafrost.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.