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saprolite

[sap-ruh-lahyt]
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noun Petrography.
  1. soft, disintegrated, usually more or less decomposed rock remaining in its original place.
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Origin of saprolite

First recorded in 1890–95; sapro- + -lite
Related formssap·ro·lit·ic [sap-ruh-lit-ik] /ˌsæp rəˈlɪt ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for saprolite

saprolite

noun
  1. a deposit of earth, clay, silt, etc, formed by decomposition of rocks that has remained in its original site
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Derived Formssaprolitic, adjective
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

saprolite in Science

saprolite

[săprə-līt′]
  1. Soft, thoroughly decomposed and porous rock, often rich in clay, formed by the in-place chemical weathering of igneous, metamorphic, or sedimentary rocks. Saprolite is especially common in humid and tropical climates. It is usually reddish brown or grayish white and contains those structures (such as cross-stratification) that were present in the original rock from which it formed.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.