noninflammable

adjective
non·in·flam·ma·ble | \ˌnän-in-ˈfla-mə-bəl \

Definition of noninflammable 

: not inflammable : nonflammable … one of the very first airships to use noninflammable helium.— Bob Marcotte a noninflammable solvent

First Known Use of noninflammable

1817, in the meaning defined above

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The first known use of noninflammable was in 1817

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