Webster's English Dictionary

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chemical

1. chem.i.cal \'kem-i-k*l\ \-i-k-(*-)le-\ aj 1: of, relating to, used in, 
   or produced by chemistry  2: acting or operated or produced by chemicals  - 
   chem.i.cal.ly av
2. chemical n : a substance obtained by a chemical process or used for 
   producing a chemi cal effect