Usually means: Ignites spontaneously in air exposure.
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We found 19 dictionaries that define the word pyrophoric:

General (16 matching dictionaries)
  1. pyrophoric: Merriam-Webster
  2. pyrophoric: Oxford Learner's Dictionaries
  3. pyrophoric: American Heritage Dictionary of the English Language
  4. pyrophoric: Collins English Dictionary
  5. pyrophoric: Wordnik
  6. pyrophoric: Wiktionary
  7. pyrophoric: Webster's New World College Dictionary, 4th Ed.
  8. pyrophoric: The Wordsmyth English Dictionary-Thesaurus
  9. pyrophoric: Infoplease Dictionary
  10. Pyrophoric, pyrophoric: Dictionary.com
  11. Pyrophoric: Wikipedia, the Free Encyclopedia
  12. Pyrophoric: Online Plain Text English Dictionary
  13. Pyrophoric: AllWords.com Multi-Lingual Dictionary
  14. pyrophoric: Stammtisch Beau Fleuve Acronyms
  15. pyrophoric: FreeDictionary.org
  16. pyrophoric: TheFreeDictionary.com

Business (1 matching dictionary)
  1. BusinessDictionary.com (No longer online)

Miscellaneous (1 matching dictionary)
  1. pyrophoric: A Word A Day

Science (1 matching dictionary)
  1. Pyrophoric: Material Safety Data Sheets HyperGlossary

Definitions from Wiktionary (pyrophoric)

adjective:  Spontaneously igniting in air, especially when in a finely divided state.
adjective:  Producing sparks, especially by friction.
adjective:  (fire investigation) Able to oxidize with exposure to atmospheric oxygen at normal temperatures.

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