Geol. a dome formation in which the rigid top layers have been split open by pressure from an underlying plastic core
Origin of diapir; from Classical Greek diapeirainein, to pierce through
A geological structure formed when a mass of material of high plasticity and low density, such as salt, gypsum, or magma, pushes upward into overlying strata.
Origin of diapirFrench, from Greek diapeirein, to push through : dia-, dia- + peirein, to pierce; see per-2 in Indo-European roots.
From Ancient Greek διαπειραίνω (diapeirainō, “to pierce through”).