nonflammable

[non-flam-uh-buhl]
adjective
not flammable; not combustible or easily set on fire.

Origin:
1960–65; non- + flammable

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
nonflammable (ˌnɒnˈflæməbəl)
 
adj
incapable of burning or not easily set on fire; not flammable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

nonflammable non·flam·ma·ble (nŏn-flām'ə-bəl)
adj.
Not flammable, especially not readily ignited and not rapidly burned.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
New ships have rigid envelopes that eliminate the need for a frame, and they
  are filled with nonflammable helium.
Gas generally regarded as nonflammable but does burn within certain vapor
  concentration limits and with strong ignition.
Materials in this group are mostly nonflammable and non-combustible.
It is nonflammable and is only slightly soluble in water.
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