Found 2 items, similar to humic acid.
English → English (WordNet) Definition: humic acid humic acid n : 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”
English → English (gcide) Definition: humic acid Humin \Hu"min\, n. [L. humus the earth, ground.] (Chem.) A bitter, brownish yellow, amorphous substance, extracted from vegetable mold, and also produced by the action of acids on certain sugars and carbohydrates; -- called also humic acid , ulmin, gein, ulmic or geic acid, etc. [1913 Webster]