chem·i·cal
ˈke-mi-kəl 
1
: of, relating to, used in, or produced by chemistry or the phenomena of chemistry
chemical reactions
2
a
: acting or operated or produced by chemicals
a chemical fire extinguisher
b
: detectable by chemical means
1
: a substance obtained by a chemical process or producing a chemical effect
2
Examples of chemical in a Sentence
Adjective
They studied the compound's chemical structure.
Recent Examples on the Web
Bojan Stojkovski, Interesting Engineering, 25 Oct. 2025
As estrogen decreases during menopause, nerves in the hypothalamus — an almond-size region deep inside the brain whose functions include helping regulate the body’s thermostat — become hyperactive and produce an overabundance of chemical signals called neurokinins.
—Jacqueline Howard, CNN Money, 24 Oct. 2025
Bojan Stojkovski, Interesting Engineering, 26 Oct. 2025
Holt’s viral TikTok about the G7’s chemical change has been viewed more than 2 million times, with users flooding the comments with similar experiences.
—Amanda Castro, MSNBC Newsweek, 26 Oct. 2025
See All Example Sentences for chemical
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Adjective
Southern China’s tropical to subtropical climate – with heavy rainfall, heat, and humidity – accelerates chemical weathering, while the region’s long history of tectonic and magmatic activity adds further erosion.
—Bojan Stojkovski, Interesting Engineering, 25 Oct. 2025
As estrogen decreases during menopause, nerves in the hypothalamus — an almond-size region deep inside the brain whose functions include helping regulate the body’s thermostat — become hyperactive and produce an overabundance of chemical signals called neurokinins.
—Jacqueline Howard, CNN Money, 24 Oct. 2025
Noun
Advances in electrode design enhance electrical performance In modern sensor technology, solid-contact ion-selective electrodes play a crucial role by converting an ion’s chemical signal into an electrical one.
—Bojan Stojkovski, Interesting Engineering, 26 Oct. 2025
Holt’s viral TikTok about the G7’s chemical change has been viewed more than 2 million times, with users flooding the comments with similar experiences.
—Amanda Castro, MSNBC Newsweek, 26 Oct. 2025
See All Example Sentences for chemical
Cite this Entry
“Chemical.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/chemical. Accessed 30 Oct. 2025.
Copy CitationKids Definition
chemical
1 of 2 adjective
chem·i·cal
ˈkem-i-kəl
1
: of, relating to, used in, or produced by chemistry
2
: acting or operated or produced by chemicals
chemical
2 of 2 noun
: a substance (as an element or compound) obtained from a chemical process or used to get a chemical result
Medical Definition
chemical
1 of 2 adjective
chem·i·cal
ˈkem-i-kəl
1
: of, relating to, used in, or produced by chemistry
2
a
: acting or operated or produced by chemicals
b
: detectable by chemical means
chemical
2 of 2 noun1
: a substance (as an element or chemical compound) obtained by a chemical process or used for producing a chemical effect
2
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