diapir, (from Greek diapeirein, “to pierce”), geological structure consisting of mobile material that was forced into more brittle surrounding rocks, usually by the upward flow of material from a parent stratum.The flow may be produced by gravitational forces (heavy rocks causing underlying lighter rocks to rise), tectonic forces (mobile rocks being squeezed through less mobile rocks by ...

The meaning of DIAPIR is an anticlinal fold in which a mobile core has broken through brittle overlying rocks.