Definitions

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

  • n. See ice fog.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from The Century Dictionary and Cyclopedia

  • n. 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 WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a dense winter fog containing ice particles

Etymologies

Shoshone pakenappeh.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Shoshone paγinappih ("thunder cloud") or a related word. (Wiktionary)

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