[dahy-uh-peer] 
| 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. |
[dahy-uh-pir-ik] , adjective | di·a·pir (dī'ə-pîr') n. An anticlinal fold in which a mobile core, such as salt or gypsum, has pierced through the more brittle overlying rock. [French, from Greek diapeirein, to push through : dia-, dia- + peirein, to pierce; see per-2 in Indo-European roots.] di'a·pir'ic adj. |
| diapir (dī'ə-pîr') Pronunciation Key
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. |