fire-retardant adjective 1noun 2forms 4 adjective1 •Hard to ignite; not flammable. noun2 •Any of several substances used to delay or prevent combustion when used as a coating or component of a combustible material.More than 100 provincial and municipal firefighters were brought in, with helicopters and aircraft used to drop water and fire retardant, while bulldozers were digging firebreaks. — 2016 •A substance that makes an object resistant to burning. formsfire retardants · fire-retardants · more fire-retardant · most fire-retardant
