volcanic bomb

From The Collaborative International Dictionary of English v.0.48:

Volcanic \Vol*can"ic\, a. [Cf. F. volcanique, It. vulcanico.]
   1. Of or pertaining to a volcano or volcanoes; as, volcanic
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   2. Produced by a volcano, or, more generally, by igneous
      agencies; as, volcanic tufa.
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   3. Changed or affected by the heat of a volcano.
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   Volcanic bomb, a mass ejected from a volcano, often of
      molten lava having a rounded form.

   Volcanic cone, a hill, conical in form, built up of
      cinders, tufa, or lava, during volcanic eruptions.

   Volcanic foci, the subterranean centers of volcanic action;
      the points beneath volcanoes where the causes producing
      volcanic phenomena are most active.

   Volcanic glass, the vitreous form of lava, produced by
      sudden cooling; obsidian. See Obsidian.

   Volcanic mud, fetid, sulphurous mud discharged by a

   Volcanic rocks, rocks which have been produced from the
      discharges of volcanic matter, as the various kinds of
      basalt, trachyte, scoria, obsidian, etc., whether compact,
      scoriaceous, or vitreous.
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From The Collaborative International Dictionary of English v.0.48:

Bomb \Bomb\, n. [F. bombe bombshell, fr. L. bombus a humming or
   buzzing noise, Gr. ?.]
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   1. A great noise; a hollow sound. [Obs.]
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            A pillar of iron . . . which if you had struck,
            would make . . . a great bomb in the chamber
            beneath.                              --Bacon.
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   2. (Mil.) A shell; esp. a spherical shell, like those fired
      from mortars. See Shell.
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   3. A bomb ketch.
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   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

   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." --Darwin.
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