
leaching
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• (n.) Lixiviating; the process of separating a soluble substance form one that is insoluble, by washing with some solvent, as water; leaching.
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Synonym: leaching. ... Origin: L. Lixivius, made into lye, fr. Lix, lye ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973

(lik-siv″e-a´shәn) separation of soluble from insoluble material by use of an appropriate solvent, and drawing off the solution.
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Lix·iv`i·a'tion noun [ Confer French
lixiviation .] Lixiviating; the process of separating a soluble substance from one that is insoluble, by washing with some solvent, as water; leaching.
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http://www.encyclo.co.uk/webster/L/53

Lixiviation is the process by wliich a soluble ingredient is separated from a substance that is otherwise insoluble by the application of water or other liquid; as, for example, the separation of pearl-ash from wood-ashes by dissolving out the potassium carbonate. The solution so obtained is called a lixivium, or lye.
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