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laccolith

[lak-uh-lith]
noun Geology.
  1. 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.
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Also lac·co·lite [lak-uh-lahyt] /ˈlæk əˌlaɪt/.

Origin of laccolith

1875–80; < Greek lákko(s) pond + -lith
Related formslac·co·lith·ic, lac·co·lit·ic [lak-uh-lit-ik] /ˌlæk əˈlɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for laccolith

laccolith

laccolite (ˈlækəˌlaɪt)

noun
  1. 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 domeSee lopolith
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Derived Formslaccolithic or laccolitic (ˌlækəˈlɪtɪk), adjective

Word Origin for laccolith

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

laccolith in Science

laccolith

[lăkə-lĭth′]
  1. 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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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.