Word:

humic acid

Noun1.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"
humic substance
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Humboldt
Humboldt current
Humbug
Humbugger
Humbuggery
humdinger
Humdrum
Hume
Humect
Humectant
Humectation
Humective
Humeral
humeral veil
Humerus
Humic
-- humic acid --
humic shale
humic substance
Humicubation
Humid
humidification
humidifier
humidify
Humidity
Humidness
humification
humified
Humifuse
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humiliated
humiliating
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