| NOUN | substance | humic substance | an organic residue of decaying organic matter |
|---|
| Meaning | An organic residue of decaying organic matter. | |
|---|---|---|
| Narrower | fulvic acid | A yellow to yellow-brown humic substance that is soluble in water under all pH conditions |
| humic acid | A dark brown humic substance that is soluble in water only at pH values greater than 2 | |
| humin | A black humic substance that is not soluble in water | |
| Broader | organic compound | Any compound of carbon and another element or a radical |
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