Definitions for "nonflammable"
Keywords:  ignite, flammable, flame, burn, easily
Not easily ignited, and burning only slowly if ignited.
Not easily ignited, or if ignited, not burning rapidly.
(adj.) : not flammable; specifically : not easily ignited and not burning rapidly if ignited; nonflammability noun (Date: 1915) (Merriam-Webster's Unabridged at www.m-w.com)