chemical

adj

1. (not-comparable)Of or relating to chemistry.

   “chemical experiments”

   “the chemical properties of iron”

   “Pentalene has chemical formula C₈H₆”

   “The physiology of matter in the abstract is dynamical, that of mineral species is both dynamical and chemical, while that of organized forms is at once dynamical, chemical, and biotical.”

   “We pinpoint all essential ingredients of intelligence found in spatio-temporal dynamics of nonlinear chemical systems, and show outlines of future designs and protypes of chemical intelligent "gooware".”

2. (not-comparable)Of or relating to a material or processes not commonly found in nature or in a particular product.
3. (not-comparable, obsolete)Of or relating to alchemy.

noun

1. Any specific chemical element or chemical compound or alloy.

   “Hydrogen and sulphur are both chemicals.”

2. (colloquial)An artificial chemical compound.

   “I color my hair with henna, not chemicals.”

   “CSPI says the Trump Administration could take steps to protect consumers from each of these chemicals and support FDA’s broader post-market assessment efforts. It could ensure that FDA sets health-protective limits on heavy metals, like lead, arsenic, and cadmium, in foods consumed by children.”

3. (slang)An addictive drug.