Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geology solid matter ejected into the air by an active volcano

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

pyro- +‎ -clast

Examples

  • But I welcome photos that you contribute, too, and this shot by Gerard Tripp of a fairly large pyroclast on Krakatau volcano, in Indonesia, is a great example of a lava bomb.

    About.com Geology

  • In the air, after it’s blown out of the volcano, it’s pyroclast—broken rock—but on the ground it’s called tephra.

    The Burning Wire

  • In the air, after it’s blown out of the volcano, it’s pyroclast—broken rock—but on the ground it’s called tephra.

    The Burning Wire

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