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diatreme

[dahy-uh-treem] /ˈdaɪ əˌtrim/
noun, Geology
1.
a volcanic vent produced in a solid rock structure by the explosive energy of gases in magmas.
Origin
1930-1935
1930-35; dia- + Greek trêma hole
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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diatreme in Science
diatreme
  (dī'ə-trēm')   
A volcanic pipe, filled with breccia, formed by a subterranean gaseous explosion. See illustration at batholith.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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