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
TimeSynonyms
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
When plasma particles from solar flares collide with molecules in the atmosphere, the electrons jump due to their excited energy level.
—Stephen J. Beard, USA TODAY, 18 May 2024
One of the latest and most promising centers around teaching the immune system to produce powerful and protective antibody responses through exposure to a series of different vaccine molecules.
—Annalisa Merelli and Jonathan Wosen, STAT, 17 May 2024
See all Example Sentences for molecule 
Stephen J. Beard, USA TODAY, 18 May 2024
One of the latest and most promising centers around teaching the immune system to produce powerful and protective antibody responses through exposure to a series of different vaccine molecules.
—Annalisa Merelli and Jonathan Wosen, STAT, 17 May 2024
See all Example Sentences for molecule
These examples are programmatically compiled from various online sources to illustrate current usage of the word 'molecule.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
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Cite this Entry
“Molecule.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/molecule. Accessed 28 May. 2024.
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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