thermobaric

of a weapon

1. :  containing a charge of fuel designed to ignite and combine with oxygen present in the atmosphere to produce a prolonged explosion Rather than fight their way into such caverns, U.S. forces have preferred to drop specialized … weapons, including thermobaric bombs that emit clouds of powdered fuel and ignite them, sending waves of heat and pressure through caverns and depleting the oxygen inside. — Peter Baker and Pamela Constable