what do flame retardant mean
Wiktionary(0.00 / 0 votes)Rate this definition: flame-retardant(Noun) A substance used to make an object flameproof. The flame-retardant used on the child's pajamas would keep them from bursting into flame, but it caused a rash. flame-retardant(Adjective) Used to describe something that is hard to ignite; that does not support or convey flame.