humic substance

/ˌ(h)jumɪk ˌsʌbstəns/
IPA guide

Definitions of humic substance
  1. noun
    an organic residue of decaying organic matter
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    types:
    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
    type of:
    organic compound
    any compound of carbon and another element or a radical
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