Definition of tephra in English:

tephra

noun

Geology
  • Rock fragments and particles ejected by a volcanic eruption.

    • ‘Some reports are stating that that tephra rim could collapse later this year.’
    • ‘Any such lateral motions could contribute to the absence or thinness of distal marine tephra layers on submarine high points or steep slopes.’
    • ‘Two types of tephra fallout deposits have been observed.’
    • ‘Southwesterly winds carried the tephra northeast and destroyed a few tens of farms.’

Origin

1940s: from Greek, literally ash, ashes.

Pronunciation:

tephra

/ˈtefrə/