[ pahy-ruh-fawr-ik, -for- ]
/ ˌpaɪ rəˈfɔr ɪk, -ˈfɒr- /
capable of igniting spontaneously in air.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for pyrophoric
These two combustibles are in such a state of division, that the residuum is pyrophoric.A Dictionary of Arts, Manufactures and Mines|Andrew Ure
The residuum of the distillation is pyrophoric and frequently inflames spontaneously, on exposure to the air.
British Dictionary definitions for pyrophoric
/ (ˌpaɪrəʊˈfɒrɪk) /
(of a chemical) igniting spontaneously on contact with air
(of an alloy) producing sparks when struck or scrapedlighter flints are made of pyrophoric alloy
Word Origin for pyrophoric
C19: from New Latin pyrophorus, from Greek purophoros fire-bearing, from pur fire + pherein to bear
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for pyrophoric
Online Etymology Dictionary, © 2010 Douglas Harper