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humic acid

 

Definitions from WordNet

Noun humic acid has 1 sense
  1. humic acid - 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"
    --1 is a kind of
    humic substance

Definitions from the Web

Humic Acid

Noun

Sense 1: A dark brown to black organic substance that is derived from decomposed plant and animal matter and is widely used as a soil conditioner and fertilizer.

Sample sentence: Farmers often use humic acid to improve the health and fertility of the soil in their fields.

Sense 2: A naturally occurring complex mixture of organic acids, mostly consisting of humic acid, fulvic acid, and hymatomelanic acid, found in lignite, coal, and peat deposits.

Sample sentence: The extraction process of humic acid from coal involves several steps to isolate and purify the desired compound.

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