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tephra

[tef-ruh] /ˈtɛf rə/
noun, (used with a plural verb)
1.
clastic volcanic material, as scoria, dust, etc., ejected during an eruption.
Origin of tephra
1960-1965
1960-65; < Greek téphra (singular) ashes
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for tephra

tephra

/ˈtɛfrə/
noun
1.
(mainly US) solid matter ejected during a volcanic eruption
Word Origin
C20: Greek, literally: ashes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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tephra in Science
tephra
  (těf'rə)   
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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