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humic acid

noun
1.
a brown, melanin-tinted mixture of polymers, found in lignite, peat, and soils, where it acts as a cation exchange agent: used in drilling fluids and inks.
Origin of humic acid
1835-1845
First recorded in 1835-45
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Based on the Random House Dictionary, © Random House, Inc. 2018.
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12
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