laccolith

 : 
Noun
 : 
lac=co=lith

CIDE DICTIONARY

laccolithn. [Gr. a cistern + -lite, -lith.].
     A mass of igneous rock intruded between sedimentary beds and resulting in a mammiform bulging of the overlying strata.  [1913 Webster]

OXFORD DICTIONARY

laccolith, n. Geol. a lens-shaped intrusion of igneous rock which thrusts the overlying strata into a dome.

Etymology
Gk lakkos reservoir + -LITH

For further exploring for "laccolith" in Webster Dictionary Online


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