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
New Horizons in Physics Prize Waseem Bakr, for the realization of quantum gas microscopes for atoms and molecules, providing a microscopic view on correlations and transport in strongly interacting quantum systems.
—Alex Cramer, HollywoodReporter, 6 Apr. 2025
Scientists have also developed a protocol that looks for certain sugar molecules in the blood.
—New Atlas, 3 Apr. 2025
As for Curiosity, which is exploring a region about 2,300 miles away, the rover recently discovered the largest organic molecules on Mars to date.
—Eric Lagatta, USA Today, 1 Apr. 2025
Researchers decades ago proposed that lightning caused chemical reactions in ancient Earth’s oceans and spontaneously produced the organic molecules.
—Mindy Weisberger, CNN Money, 28 Mar. 2025
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Alex Cramer, HollywoodReporter, 6 Apr. 2025
Scientists have also developed a protocol that looks for certain sugar molecules in the blood.
—New Atlas, 3 Apr. 2025
As for Curiosity, which is exploring a region about 2,300 miles away, the rover recently discovered the largest organic molecules on Mars to date.
—Eric Lagatta, USA Today, 1 Apr. 2025
Researchers decades ago proposed that lightning caused chemical reactions in ancient Earth’s oceans and spontaneously produced the organic molecules.
—Mindy Weisberger, CNN Money, 28 Mar. 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 12 Apr. 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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