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regolith

[reg-uh-lith]
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noun
  1. mantle rock.
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Origin of regolith

1895–1900; < Greek rhêgo(s) rug, blanket + -lith
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for regolith

regolith

noun
  1. the layer of loose material covering the bedrock of the earth and moon, etc, comprising soil, sand, rock fragments, volcanic ash, glacial drift, etc
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Word Origin

C20: from Greek rhēgos covering, blanket + lithos stone
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

Word Origin and History for regolith

n.

1897, from Greek rhegos "rug, blanket," from PIE *reg- (3) "to dye" (see raga) + lithos "stone" (see litho-).

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Online Etymology Dictionary, © 2010 Douglas Harper
regolith in Science

regolith

[rĕg′ə-lĭth′]
  1. The layer of rock and mineral fragments that rests on bedrock and is produced by the weathering of rocks. Regolith constitutes the surface of most land.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.