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Definition from macmillandictionary.com

chemical

 
 
 
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noun [countable] American English pronunciation: chemical /ˈkemɪk(ə)l/ 
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singularchemical
pluralchemicals
  1. a substance used in chemistry or produced by a process involving chemistry

    You must wear gloves when handling any of these chemicals.

    the chemical industry

    the dumping of toxic chemicals

This is the American English definition of chemical. View British English definition of chemical.