pyrophoric


Concise Oxford English Dictionary © 2008 Oxford University Press:
pyrophoric /ˌpʌɪrə(ʊ)ˈfɒrɪk/
adjective
  • 1 liable to ignite spontaneously in air.
  • 2 (of an alloy) emitting sparks when scratched or struck.
– origin C19: from mod. L. pyrophorus, from Gk purophoros ‘fire-bearing’.
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