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
There is a molecule of evidence to support these charges.
Examples 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
These molecules neutralize free radicals, the unstable molecules that can damage cells.
—
Ann Pietrangelo, Verywell Health, 27 Dec. 2025
The ultraviolet light triggered a reaction between the nanotube and the iodobenzene molecules, creating a tiny defect in the carbon structure.
—Rupendra Brahambhatt, Interesting Engineering, 27 Dec. 2025
As of Volume 1’s release, the gross fleshy tube that attaches to Will and the 12 children’s mouths apparently particalizes them with Mind Flayer molecules.
—Dessi Gomez, Deadline, 25 Dec. 2025
Making another peptide would not be a huge leap; retatrutide as a molecule is not especially difficult for a knowledgeable chemist to copy.
—Sarah Zhang, The Atlantic, 23 Dec. 2025
See All Example Sentences for molecule
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Ann Pietrangelo, Verywell Health, 27 Dec. 2025
The ultraviolet light triggered a reaction between the nanotube and the iodobenzene molecules, creating a tiny defect in the carbon structure.
—Rupendra Brahambhatt, Interesting Engineering, 27 Dec. 2025
As of Volume 1’s release, the gross fleshy tube that attaches to Will and the 12 children’s mouths apparently particalizes them with Mind Flayer molecules.
—Dessi Gomez, Deadline, 25 Dec. 2025
Making another peptide would not be a huge leap; retatrutide as a molecule is not especially difficult for a knowledgeable chemist to copy.
—Sarah Zhang, The Atlantic, 23 Dec. 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 31 Dec. 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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