Definition of chemical noun from the Oxford Advanced Learner's Dictionary

    

chemical

 noun
noun
BrE BrE//ˈkemɪkl//
 
; NAmE NAmE//ˈkemɪkl//
 
 
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 a substance obtained by or used in a chemical process Farmers are being urged to reduce their use of chemicals and work with nature to combat pests. Word Origin late 16th cent.: from French chimique or modern Latin chimicus, chymicus, from medieval Latin alchymicus, from alchimia, from Arabic al-kīmiyā', from al ‘the’ + kīmiyā' (from Greek khēmia, khēmeia ‘art of transmuting metals’).Extra examples We don’t use many chemicals on our farm these days. chemicals discharged by industry into our lakes and rivers pollution from a big chemical plant Hormones are chemicals that are released in the body and control many important functions. This chemical is often used to make cleaning products.
See the Oxford Advanced American Dictionary entry: chemical