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
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When mixed with guar gum that is extracted from guar beans, these crystals are able to bind regolith particles together to form bricks. Keith Cooper, Space.com, 6 Apr. 2025 Turning Moon Dust into Power Vision of future solar cell fabrication on the Moon, utilizing raw regolith. Paul Smaglik, Discover Magazine, 3 Apr. 2025 In a final step, the regolith was left to cool at room temperature for about 16 hours. Ben Coxworth, New Atlas, 11 July 2024 Actual regolith may react quite differently than our simulants. Sven Bilén, The Conversation, 13 Mar. 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 10 Apr. 2025.

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