chemical chemical /ˈkɛmɪkəl/

adjective

1. () Relating to or used in chemistry  ( chemic [Archaic] , chemical )
   relating to or used in chemistry
    Chemical engineer
   chemical engineer
    Chemical balance
   chemical balance
   
2. () Of or made from or using substances produced by or used in reactions involving atomic or molecular changes  ( chemical )
   of or made from or using substances produced by or used in reactions involving atomic or molecular changes
    Chemical fertilizer
   chemical fertilizer
   

noun

1. () Material produced by or used in a reaction involving changes in atoms or molecules  ( chemical substance , chemical )
   material produced by or used in a reaction involving changes in atoms or molecules