tephra

[tef-ruh]
noun (used with a plural verb)
clastic volcanic material, as scoria, dust, etc., ejected during an eruption.

Origin:
1960–65; < Greek téphra (singular) ashes

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Collins
World English Dictionary
tephra (ˈtɛfrə)
 
n
chiefly (US) solid matter ejected during a volcanic eruption
 
[C20: Greek, literally: ashes]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
tephra   (těf'rə)  Pronunciation Key 
Solid matter, such as ash, dust, and cinders, that is ejected into the air by an erupting volcano. Tephra is a general term for all pyroclastic materials ejected from a volcano.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The slope's top layer is crumbly tephra, sometimes as big as charcoal
  briquettes.
Eruptive behavior has varied from vigorous explosions, accompanied by tephra
  falls and pyroclastic flows, to effusive lava flows.
The heavy tephra fall caused severe property damage a few days after the onset
  of the eruption.
Tephra ingested by vehicle engines can clog filters and increase wear.
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