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 hotter evening side appears warm enough to break apart water molecules in the upper atmosphere, the study notes.
—
Sharmila Kuthunur, Space.com, 16 June 2026
Termites don’t get a lot of nitrogen in their diet of wood, which is largely comprised of a polymer of sugar molecules.
—John Timmer, ArsTechnica, 16 June 2026
During its journey through the atmosphere over tens of miles, the asteroid collides with air molecules, and the incredible temperatures and pressure usually vaporize it.
—Adam Lark, The Conversation, 16 June 2026
Lactones are creamy, milky molecules that are naturally found in figs and can be artificially replicated to mimic the smell of sandalwood.
—Ariel Wodarcyk, InStyle, 15 June 2026
See All Example Sentences for molecule
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Sharmila Kuthunur, Space.com, 16 June 2026
Termites don’t get a lot of nitrogen in their diet of wood, which is largely comprised of a polymer of sugar molecules.
—John Timmer, ArsTechnica, 16 June 2026
During its journey through the atmosphere over tens of miles, the asteroid collides with air molecules, and the incredible temperatures and pressure usually vaporize it.
—Adam Lark, The Conversation, 16 June 2026
Lactones are creamy, milky molecules that are naturally found in figs and can be artificially replicated to mimic the smell of sandalwood.
—Ariel Wodarcyk, InStyle, 15 June 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 19 Jun. 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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