معنی کلمه chemical

some canned foods contain harmful chemicals

برخی از خوراک‌های توی قوطی دارای مواد شیمیایی مضری هستند.

any basic substance that is used in or produced by a reaction involving changes to atoms or molecules:
The government has pledged to reduce the amount of chemicals used in food production.
Each year, factories release millions of tons of toxic (= poisonous) chemicals into the atmosphere.

More examples

They use special chemicals to accelerate the growth of crops.
Organic chemicals are used in the manufacture of plastics, fibres, solvents and paints.
The body produces chemicals that are natural painkillers.
Toxic chemicals continue to be dumped in the North Sea.
Many chemicals have a damaging effect on the environment.

pertaining to chemistry, used in a chemical process

chemical substance

product manufactured by means of chemicals

a substance used in chemistry or produced by a chemical process

a chemical preparation = يک ترکيب شيميايى

chemical ammunition = مهمات شيميايى

Who can gave me an example of rapid chemical reaction?

The advances were not merely mechanical but chemical as well.