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3 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 hu·mic acid /ˈhjumɪk, ˈju-/ 名詞
 腐殖酸,黑腐酸

From: Webster's Revised Unabridged Dictionary (1913)

 Hu·min n.  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.
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From: WordNet (r) 2.0

 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"