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[dahy-uh-peer] /ˈdaɪ əˌpɪər/
noun, Geology.
a dome, or anticline, the upper regions of which have been ruptured and penetrated by material squeezed up from below.
Compare plume (def 10), salt dome.
Origin of diapir
1915-20; < French, said to be < Greek diapeírein to drive through, pierce; dia- dia- + peírein to pierce
Related forms
[dahy-uh-pir-ik] /ˌdaɪ əˈpɪr ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for diapir


(geology) an anticlinal fold in which the brittle overlying rock has been pierced by material, such as salt, from beneath
Word Origin
C20: from Greek diapeirainein to make holes through, pierce
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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diapir in Science
A fold or dome, such as an anticline, in which the upper strata of sediment or rock have been ruptured by the upward movement of more plastic rock, such as a body of salt, gypsum, or lava.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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