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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
1835-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for humic acid
  • Characterization of humic acid fractions improves estimates of nitrogen mineralization kinetics for lowland rice soils.

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12
14
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