diatreme

diatreme

[dahy-uh-treem]
noun Geology.
a volcanic vent produced in a solid rock structure by the explosive energy of gases in magmas.

Origin:
1930–35; dia- + Greek trêma hole

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Science Dictionary
diatreme   (dī'ə-trēm')  Pronunciation Key 
A volcanic pipe, filled with breccia, formed by a subterranean gaseous explosion. See illustration at batholith.
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