Bomb n.
 1. A great noise; a hollow sound. [Obs.]
    A pillar of iron . . . which if you had struck, would make . . . a great bomb in the chamber beneath.   --Bacon.
 2. Mil. A shell; esp. a spherical shell, like those fired from mortars. See Shell.
 3. A bomb ketch.
 Bomb chest Mil., a chest filled with bombs, or only with gunpowder, placed under ground, to cause destruction by its explosion.
 Bomb ketch, Bomb vessel Naut., a small ketch or vessel, very strongly built, on which mortars are mounted to be used in naval bombardments; -- called also mortar vessel.
 Bomb lance, a lance or harpoon with an explosive head, used in whale fishing.
 Volcanic bomb, a mass of lava of a spherical or pear shape. “I noticed volcanic bombs.”