noun
- A dark brown humic substance that is soluble in water only at pH values greater than 2.
- usage: "the half-life of humic acid is measured in centuries"
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). humic acid. Retrieved September 27, 2026, from http://smartdefine.org/humic_acid/definitions/1248832 |
| Chicago | WordNet. 2010. "humic acid" http://smartdefine.org/humic_acid/definitions/1248832 (accessed September 27, 2026). |
| Harvard | WordNet 2010, humic acid, Smart Define, viewed 27 September, 2026, <http://smartdefine.org/humic_acid/definitions/1248832>. |
| MLA | WordNet. "humic acid" 23 October 2010. Web. 27 September 2026. <http://smartdefine.org/humic_acid/definitions/1248832> |