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English definition of “chemical”

chemical

noun [C] uk   /ˈkem.ɪ.kəl/ us  
B2 any basic substance that is used in or produced by a reaction involving changes to atoms or molecules: The government has pledged to reduce the amount of chemicals used in food production. Each year, factories release millions of tons of toxic (= poisonous) chemicals into the atmosphere.

chemical

adjective uk   /ˈkem.ɪ.kəl/ us  
B2 relating to chemicals: The chemical industry produces such things as petrochemicals, drugs, and rubber.
chemically
adverb uk   /-i/ us  
The fund provides money to clean up chemically polluted industrial sites.
(Definition of chemical from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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