marl 1 (märl)
A crumbly mixture of clays, calcium and magnesium carbonates, and remnants of shells that is sometimes found under desert sands and used as fertilizer for lime-deficient soils.
tr.v. marled, marl·ing, marls
To fertilize with such a mixture.
[Middle English marle, from Old French, from Medieval Latin margila, marla, diminutive of Latin marga, marl, of Celtic origin.]
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