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diapir

[dahy-uh-peer]
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noun Geology.
  1. 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.
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Origin of diapir

1915–20; < French, said to be < Greek diapeírein to drive through, pierce; dia- dia- + peírein to pierce
Related formsdi·a·pir·ic [dahy-uh-pir-ik] /ˌdaɪ əˈpɪr ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for diapir

diapir

noun
  1. geology an anticlinal fold in which the brittle overlying rock has been pierced by material, such as salt, from beneath
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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

diapir in Science

diapir

[dīə-pîr′]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.