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rock milk

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noun

a white, powdery surface crust of calcite, formed by efflorescence in limestone caves and fissures.

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“Evoke” and “invoke” both derive from the same Latin root “vocāre.”

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Also called agaric mineral .

Origin of rock milk

First recorded in 1795–1805
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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