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 of humic acid
First recorded in 1835–45
Words nearby humic acid
humeroradial,
humeroscapular,
humeroulnar,
humerus,
humic,
humic acid,
humicole,
humicolous,
humid,
humidex,
humidifier