Definition of regolith
: unconsolidated residual or transported material that overlies the solid rock on the earth, moon, or a planet
Recent Examples of regolith from the Web
Fierce competition The students' task was to drill through about 16 inches (0.5 meters) of simulated Martian soil (regolith) to get to solid ice blocks that were about the same depth.
By happy coincidence, oxygen is one of the main components — more than 40 percent by mass — of regolith, the fine dust that blankets the lunar surface.
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Britannica.com: Encyclopedia article about regolith
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