Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Solid matter that is ejected into the air by an erupting volcano.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The solid material thrown into the air by a volcanic eruption that settles on the surrounding areas.

Etymologies

Greek tephrā, ash; see dhegwh- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From the Ancient Greek τέφρα (tephra, "ash"). (Wiktionary)

Examples

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  • Geol.
    Dust and rock fragments that have been ejected into the air by a volcanic eruption.
    (OED)

    March 11, 2007