'nonflammable' definitions:

Definition of 'nonflammable'

From: WordNet
adjective
Impossible to ignite

Definition of 'nonflammable'

From: GCIDE
  • nonflammable \nonflammable\ adj. Not easily ignited, and burning only slowly if ignited. [Narrower terms: {noncombustible (vs. combustible), incombustible}] WordNet 1.5]