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[reg-uh-lith] /ˈrɛg ə lɪθ/
Origin of regolith
1895-1900; < Greek rhêgo(s) rug, blanket + -lith Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for regolith
  • Gather some regolith from an asteroid into bags for extra shielding at the sides.
  • On the moon, the panel must also survive the dusty environment cause by the regolith.
  • The scanning electron micrograph of the ash particle reminds me of similar pictures of regolith.
  • Without the print, it could be that, or it could be regolith.
  • Sure, a lot of energy is needed to extract and purify these from lunar regolith, but that is what nuclear power is for.
British Dictionary definitions for regolith


the layer of loose material covering the bedrock of the earth and moon, etc, comprising soil, sand, rock fragments, volcanic ash, glacial drift, etc
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
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Word Origin and History for regolith

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

Online Etymology Dictionary, © 2010 Douglas Harper
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regolith in Science
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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