| NOUN | substance | humic acid | a dark brown humic substance that is soluble in water only at pH values greater than 2 |
|---|
| Meaning | A dark brown humic substance that is soluble in water only at pH values greater than 2. | |
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| Example | "the half-life of humic acid is measured in centuries" | |
| Broader | humic substance | An organic residue of decaying organic matter |
| Catalan | àcid húmic | |
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