To burn with a sudden and sparkling combustion, as niter; also, to snap and crackle with slight explosions when heated, as salt.
To cause to burn with sudden and sparkling combustion, as by the action of intense heat; to burn or vaporize suddenly; as, to deflagrate refractory metals in the oxyhydrogen flame.
cause to burn rapidly and with great intensity; "care must be exercised when this substance is to be deflagrated"
burn with great heat and intense light; "the powder deflagrated"
To burn or vaporize suddenly, usually accompanied by a considerable amount of heat and large volumes of gas. When the speed of the burn or the escaping gas exceeds the speed of sound, the result is a loud boom. Deflagration is the scientific term for how fireworks explode.