adjective

1. of or having to do with chemistry
2. made by or used in chemistry
3. operated or made by the use of chemicals chemical burns
4. ☆ of or involving the use of a drug, alcoholic liquor, etc. chemical dependency

Etymology: chemic + -al

noun

1. any substance used in or obtained by a chemical process
2. ☆ Slang a drug, alcoholic beverage, etc.