Definition from Wiktionary, the free dictionary
chemical (not comparable)
relating to chemistry
Derived terms 
chemical (plural chemicals)
- (chemistry, sciences) Any specific chemical element or chemical compound.
- An artificial chemical compound.
- I color my hair with henna, not chemicals.
- (slang) An addictive drug.
Usage notes 
- The noun is frequently used in a slang and more specific non-technical way (2nd and 3rd definition) by the general public. Chemists and those who understand chemistry may gravitate toward the first, but the term "substance" is preferred usage.
any specific element or chemical compound
an artificial chemical compound
an addictive drug
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