regolith

noun

reg·​o·​lith ˈre-gə-ˌlith How to pronounce regolith (audio)
: unconsolidated residual or transported material that overlies the solid rock on the earth, moon, or a planet

Examples of regolith in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The contact surface is wide like a snowshoe because the regolith is fluffy and volatile, with some steep inclines, so this will be needed to maintain traction. James Morris, Forbes.com, 12 Apr. 2025 Concentrated sunlight alone should provide enough heat to transform lunar regolith into glass. Paul Smaglik, Discover Magazine, 3 Apr. 2025 Moon photovoltaics utilizing lunar regolith and halide perovskites. Ian Randall, MSNBC Newsweek, 7 Apr. 2025 Actual samples of lunar regolith are rare and precious, and therefore simulants, which aim to replicate different types of regolith, are used for experiments instead. Keith Cooper, Space.com, 6 Apr. 2025 See All Example Sentences for regolith

Word History

Etymology

Greek rhēgos blanket + English -lith; akin to Greek rhezein to dye — more at raga

First Known Use

1897, in the meaning defined above

Time Traveler
The first known use of regolith was in 1897

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Cite this Entry

“Regolith.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/regolith. Accessed 6 May. 2025.

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