Fire Ball : (1) A spherical mass of flame which may occur if a large quantity of flammable vapour suddenly ignites. (2) Luminous ball-shaped cloud of a nuclear explosion. (3) Very bright meteorite; a bolide
H. J. Porter (Chairman - Technical Committee), Dictionary of Fire Technology, The Institution of Fire Engineers, The Victory Press (Leicester) Ltd. 1979 UK. (Fr Tech - Brit) {81}