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[lak-uh-lith] /ˈlæk ə lɪθ/
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] /ˈlæk əˌlaɪt/ (Show IPA)
Origin of laccolith
1875-80; < Greek lákko(s) pond + -lith
Related forms
laccolithic, laccolitic
[lak-uh-lit-ik] /ˌlæk əˈlɪt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for laccolith


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 See lopolith
Derived Forms
laccolithic, laccolitic (ˌlækəˈlɪtɪk) adjective
Word Origin
C19: from Greek lakkos cistern + -lith
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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laccolith in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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