rock flour

noun

Definition of rock flour

: finely powdered rock material produced by grinding action (as of a glacier on its bed)

called also glacial meal

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Learn More About rock flour

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Cite this Entry

“Rock flour.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rock%20flour. Accessed 1 Jul. 2022.

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