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 team enhanced the design using small-molecule amidinium ligands.
—
Mrigakshi Dixit, Interesting Engineering, 12 Jan. 2026
Signals from the gut make the situation worse by encouraging immune cells to release harmful molecules.
—Pranjal Malewar, New Atlas, 11 Jan. 2026
However, as antioxidants, the polyphenols in olive oil can neutralize those harmful molecules, thereby reducing oxidative stress and disease risk.
—Kirsten Nunez, Martha Stewart, 10 Jan. 2026
Eli Lilly’s orforglipron is a small-molecule drug that is absorbed more easily in the body and doesn’t require dietary restrictions like Novo Nordisk’s pill, which is a peptide medication.
—Annika Kim Constantino, CNBC, 10 Jan. 2026
See All Example Sentences for molecule
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Mrigakshi Dixit, Interesting Engineering, 12 Jan. 2026
Signals from the gut make the situation worse by encouraging immune cells to release harmful molecules.
—Pranjal Malewar, New Atlas, 11 Jan. 2026
However, as antioxidants, the polyphenols in olive oil can neutralize those harmful molecules, thereby reducing oxidative stress and disease risk.
—Kirsten Nunez, Martha Stewart, 10 Jan. 2026
Eli Lilly’s orforglipron is a small-molecule drug that is absorbed more easily in the body and doesn’t require dietary restrictions like Novo Nordisk’s pill, which is a peptide medication.
—Annika Kim Constantino, CNBC, 10 Jan. 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 15 Jan. 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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