molecule
noun
mol·e·cule
ˈmä-li-ˌkyül 
1
: the smallest particle of a substance that retains all the properties (see property sense 1a) of the substance and is composed of one or more atoms (see atom sense 1a)
a molecule of water
a molecule of oxygen
2
: a tiny bit : particle
a molecule of political honesty—
Time
TimeExamples of molecule in a Sentence
There is not a molecule of evidence to support these charges.
not a molecule of sense in that girl
Recent Examples on the Web
Not a single molecule of carbon dioxide is released during the process.
—Michael Franco, New Atlas, 13 Mar. 2025
Oxidative stress is an imbalance in the body of unstable molecules called free radicals and antioxidants.
—Emily Kay Votruba, EverydayHealth.com, 12 Mar. 2025
Free radicals are unstable molecules that cause cell damage.
—Daniel More, Verywell Health, 12 Mar. 2025
And Sinclair has created a company, Metro International Biotech, that is manufacturing a precursor molecule that the body turns into NAD; human testing began in March.
—Alice Park, TIME, 11 Mar. 2025
See All Example Sentences for molecule
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Michael Franco, New Atlas, 13 Mar. 2025
Oxidative stress is an imbalance in the body of unstable molecules called free radicals and antioxidants.
—Emily Kay Votruba, EverydayHealth.com, 12 Mar. 2025
Free radicals are unstable molecules that cause cell damage.
—Daniel More, Verywell Health, 12 Mar. 2025
And Sinclair has created a company, Metro International Biotech, that is manufacturing a precursor molecule that the body turns into NAD; human testing began in March.
—Alice Park, TIME, 11 Mar. 2025
See All Example Sentences for molecule
Articles Related to molecule
Cite this Entry
“Molecule.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/molecule. Accessed 22 Mar. 2025.
Copy CitationKids Definition
molecule
noun
mol·e·cule
ˈmäl-i-ˌkyü(ə)l
1
: the smallest particle of a substance having all the characteristics of the substance
a molecule of water
a molecule of oxygen
2
: a very small bit : particle
Medical Definition
molecule
noun
mol·e·cule
ˈmäl-i-ˌkyü(ə)l
: the smallest particle of a substance that retains all the properties of the substance and is composed of one or more atoms
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