Definition of diapir
: an anticlinal fold in which a mobile core has broken through brittle overlying rocks
diapiricplay \ˌdī-ə-ˈpir-ik\ adjective
Origin and Etymology of diapir
French, probably from Greek diapeirein to drive through, from dia- + peirein to pierce; akin to Greek poros passage — more at fare
First Known Use: 1918
Seen and Heard
What made you want to look up diapir? Please tell us where you read or heard it (including the quote, if possible).