A ball filled with powder or other combustibles, intended to be thrown among enemies, and to injure by explosion; also, to set fire to their works and light them up, so that movements may be seen.
- A brilliantly burning sphere.
- A highly luminous, intensely hot spherical cloud of dust, gas, and vapor generated by a nuclear explosion.
- A meteor that is as bright or brighter than the brightest planets.
- See ball of fire.