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
Your body uses tryptophan to synthesize several important molecules, including melatonin and serotonin.
—Merve Ceylan, Health, 12 May 2025
So, rather than showing chemical fingerprints that could indicate the presence of atmospheric molecules like carbon dioxide, methane or water vapor, the spectra of sub-Neptunes have generally offered little useful information.
—Victoria Corless, Space.com, 7 May 2025
Once nine of these gene clusters were identified, the DNA that would encode them was ordered and assembled into a single DNA molecule in yeast.
—ArsTechnica, 7 May 2025
So far, the rovers on Mars have found some organic molecules and chemical signatures that could have come from either abiotic − nonliving − sources or past life.
—Elisabeth M. Hausrath, The Conversation, 6 May 2025
See All Example Sentences for molecule
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Merve Ceylan, Health, 12 May 2025
So, rather than showing chemical fingerprints that could indicate the presence of atmospheric molecules like carbon dioxide, methane or water vapor, the spectra of sub-Neptunes have generally offered little useful information.
—Victoria Corless, Space.com, 7 May 2025
Once nine of these gene clusters were identified, the DNA that would encode them was ordered and assembled into a single DNA molecule in yeast.
—ArsTechnica, 7 May 2025
So far, the rovers on Mars have found some organic molecules and chemical signatures that could have come from either abiotic − nonliving − sources or past life.
—Elisabeth M. Hausrath, The Conversation, 6 May 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 19 May. 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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