noun Geology.
a mass of igneous rock formed from magma that did not find its way to the surface but spread laterally into a lenticular body, forcing overlying strata to bulge upward.
Also, laccolite [lak-uh-lahyt] .

1875–80; < Greek lákko(s) pond + -lith

laccolithic, laccolitic [lak-uh-lit-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
laccolith or laccolite (ˈlækəlɪθ, ˈlækəˌlaɪt)
See lopolith a dome-shaped body of igneous rock between two layers of older sedimentary rock: formed by the intrusion of magma, forcing the overlying strata into the shape of a dome
[C19: from Greek lakkos cistern + -lith]
laccolite or laccolite
[C19: from Greek lakkos cistern + -lith]
lacco'lithic or laccolite
laccolitic or laccolite

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
laccolith   (lāk'ə-lĭth')  Pronunciation Key 
A body of igneous rock intruded between layers of sedimentary rock, resulting in uplift. Laccoliths are usually plano-convex in cross-section, having a flat bottom and a convex top, and are roughly circular in plan. They are usually connected to a dike and are typically up to 8 km (5 mi) in diameter and tens to hundreds of meters thick. See illustration at batholith.
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