What does chemical mean?
'Chemical' functions both as an adjective and a noun. As an adjective, it describes anything relating to chemistry — the science concerned with the composition, structure, properties, and reactions of substances — as in a chemical reaction or chemical bond. As a noun, it denotes a specific substance, typically one produced by or used in a chemical process, such as industrial chemicals or agricultural chemicals. The word is neutral in scientific contexts but often acquires negative connotations in everyday speech, where it can imply something synthetic, artificial, or hazardous; phrases like 'chemical-free' reflect this popular usage even though, strictly speaking, all matter consists of chemicals. Derived from 'chemistry', whose roots trace back through alchemy to Arabic and ultimately Greek origins, 'chemical' entered English in the sixteenth century. It remains indispensable across science, industry, medicine, and environmental discourse.
Relating to chemistry, or to the composition, properties, and reactions of substances.
"The soil's chemical balance must be tested before planting."
A compound or substance prepared by or used in a chemical process, especially one used in industry or agriculture.
"Household chemicals should be stored out of reach of children."
The plural 'chemicals' is the standard form when referring to more than one substance; it is common in scientific, regulatory, and everyday contexts.
"The new regulations restrict the use of certain agricultural chemicals."
The word 'chemical' descends from 'alchemy' — the very science once dismissed as magic is now the backbone of modern medicine, materials, and industry.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of chemical
'Chemical' derives from 'chemistry', which entered English in the early seventeenth century from French 'chimie' and Latin 'chemia'. These trace back through Medieval Latin to Arabic 'al-kīmiyāʾ', itself borrowed from Greek 'khēmeía', likely via the Egyptian word 'kēme' meaning Egypt or its black fertile soil. The related word 'alchemy' shares this same lineage, reflecting how modern chemistry grew out of the older tradition of alchemy.
Related word forms
How chemical is actually used
In everyday use as an adjective, 'chemical' often carries an informal connotation of artificiality or harm (as in 'chemical-free'), which scientists generally regard as imprecise since all matter is chemical in nature. The plural noun form is standard for referring to multiple substances.
Easily confused with chemical
Alchemical refers specifically to the medieval pseudoscience of alchemy, whereas chemical refers to modern chemistry or substances in general.