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
The model is based on how lithium ions propagate through a battery’s electrodes, similar to how caffeine molecules dissolve from coffee grounds.
—
ArsTechnica, 28 Apr. 2026
There’s Can’t Get Enough, part of the Carnal Blends with fragrances including an overdose of hedione, a molecule said to activate pheromones.
—Jennifer Weil, Footwear News, 28 Apr. 2026
The South China Morning Post stated that this molecule uses its rigid, bulky structure to physically shield the iron core from chemical attack, while its strong negative charge creates a force field that repels leaking particles.
—Mrigakshi Dixit, Interesting Engineering, 27 Apr. 2026
Most phases of ice send the rays bouncing in just a couple different directions, since their crystal patterns repeat after a few molecules.
—Shalma Wegsman, Quanta Magazine, 27 Apr. 2026
See All Example Sentences for molecule
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ArsTechnica, 28 Apr. 2026
There’s Can’t Get Enough, part of the Carnal Blends with fragrances including an overdose of hedione, a molecule said to activate pheromones.
—Jennifer Weil, Footwear News, 28 Apr. 2026
The South China Morning Post stated that this molecule uses its rigid, bulky structure to physically shield the iron core from chemical attack, while its strong negative charge creates a force field that repels leaking particles.
—Mrigakshi Dixit, Interesting Engineering, 27 Apr. 2026
Most phases of ice send the rays bouncing in just a couple different directions, since their crystal patterns repeat after a few molecules.
—Shalma Wegsman, Quanta Magazine, 27 Apr. 2026
See All Example Sentences for molecule
Cite this Entry
“Molecule.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/molecule. Accessed 30 Apr. 2026.
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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