humic acid


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.

Nearby words

  1. humeroradial,
  2. humeroscapular,
  3. humeroulnar,
  4. humerus,
  5. humic,
  6. humicole,
  7. humicolous,
  8. humid,
  9. humidex,
  10. humidifier

Origin of humic acid

First recorded in 1835–45 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019