[ 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

di·a·pir·ic [dahy-uh-pir-ik] /ˌdaɪ əˈpɪr ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for diapir


/ (ˈdaɪəˌpɪə) /


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

Word Origin for diapir

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

Science definitions for diapir


[ dīə-pîr′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.