laccolith


lac·co·lith

noun \ˈla-kə-ˌlith\

Definition of LACCOLITH

:  a mass of igneous rock that is intruded between sedimentary beds and produces a domical bulging of the overlying strata
lac·co·lith·ic \ˌla-kə-ˈli-thik\ adjective

Origin of LACCOLITH

Greek lakkos pond, reservoir + English -lith — more at lake
First Known Use: 1879

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