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Meaning of diapir

di•a•pir

Pronunciation: (dī'u-pēr"), [key]
— n. Geol.
  1. a dome, or anticline, the upper regions of which have been ruptured and penetrated by material squeezed up from below. Cf. plume (def. 10),
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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