a solution resulting from leaching, as of soluble constituents from soil, landfill, etc., by downward percolating ground water: Leachates in the town's water supply have been traced to a chemical-waste dump.

1930–35; leach1 + -ate2

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World English Dictionary
leachate (ˈliːtʃeɪt)
water that carries salts dissolved out of materials through which it has percolated, esp polluted water from a refuse tip

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Example sentences
The leachate is then pumped into a single double-lined storage lagoon for holding.
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