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
Faster movement of air molecules produces a higher temperature, and slower movement results in lower temperatures.
—Mary Wasson, Austin American Statesman, 24 July 2025
Just as the Statue of Zeus represented wisdom and power, AI has noble applications across healthcare, including unraveling the complexities of biological systems where billions of molecules work together to drive the human body.
—Dean Debiase, Forbes.com, 23 July 2025
Antioxidants counter destructive free radical molecules in cells, acting to reduce inflammation and the risk of chronic disease.
—Angelica Bottaro, Verywell Health, 23 July 2025
The touch of the grill is felt in every corner of the room, like a high-sillage perfume made of the primal, appetite-turbocharging molecules of smoke and meat and sweetness.
—Helen Rosner, New Yorker, 20 July 2025
See All Example Sentences for molecule
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Mary Wasson, Austin American Statesman, 24 July 2025
Just as the Statue of Zeus represented wisdom and power, AI has noble applications across healthcare, including unraveling the complexities of biological systems where billions of molecules work together to drive the human body.
—Dean Debiase, Forbes.com, 23 July 2025
Antioxidants counter destructive free radical molecules in cells, acting to reduce inflammation and the risk of chronic disease.
—Angelica Bottaro, Verywell Health, 23 July 2025
The touch of the grill is felt in every corner of the room, like a high-sillage perfume made of the primal, appetite-turbocharging molecules of smoke and meat and sweetness.
—Helen Rosner, New Yorker, 20 July 2025
See All Example Sentences for molecule
Cite this Entry
“Molecule.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/molecule. Accessed 29 Jul. 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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