1895–1900; < Greek rhêgo(s) rug, blanket + -lith Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
regolith (ˈrɛɡəlɪθ)
the layer of loose material covering the bedrock of the earth and moon, etc, comprising soil, sand, rock fragments, volcanic ash, glacial drift, etc
[C20: from Greek rhēgos covering, blanket + lithos stone]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
regolith   (rěg'ə-lĭth')  Pronunciation Key 
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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Example sentences
Gather some regolith from an asteroid into bags for extra shielding at the
On the moon, the panel must also survive the dusty environment cause by the
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.
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