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coal / charcoal / smut (range of fungi that cause crop disease); fungus of the genus Ustilago
Coal is an important source of energy in many countries.
(chemistry) activated carbon (a very absorbent form of finely-powdered carbon)
Activated carbon is widely used in water filters and treatment of poisonings.
animal charcoal (fine charcoal prepared by calcining bones)
Animal charcoal is used in the production of organic fertilizers.
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