humic-acid

humic acid

noun
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:
1835–45

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
humic acid

noun
a dark brown humic substance that is soluble in water only at pH values greater than 2; "the half-life of humic acid is measured in centuries" 
WordNet® 3.0, © 2006 by Princeton University.
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