from The Century Dictionary.

  • noun A frozen fog, formed in the coldest weather in the mountain valleys of Idaho, Nevada, and Colorado. When inhaled it often produces severe pulmonary trouble.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A ice fog which forms in valleys in the Western United States.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a dense winter fog containing ice particles


from The American Heritage® Dictionary of the English Language, 4th Edition

[Shoshone pakenappeh.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Shoshone paγinappih ("thunder cloud") or a related word.


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