/ Dictionary / Index D diapir: Meaning and Definition of Find definitions for: di•a•pir Pronunciation: (dī'u-pēr"), [key] — n. Geol. 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. See also: diapir (Thesaurus) diaphysis diapophysis Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language