Fireball meaning : A ball of fire, especially one associated with an explosion. A meteor bright enough to cast shadows. A class of sailing dinghy with a single trapeze and a symmetrical spinnaker, sailed by a crew of two. A charge made of a disc-shaped bomb shell, with four sets of flames, at the top, bottom and on either side. A ball filled with combustibles to be thrown among enemies. To explode in a ball of flame. To pitch the ball very fast. To attack with balls of fire.