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
In this condition, the tick introduces a sugar molecule in its saliva called alpha-gal into the human body upon biting, which can trigger an immune response in some individuals.
—
Omer Awan, Forbes.com, 23 June 2026
Stepping in for the night shift, the Infil Serum sends hyaluronic acid molecules deep into the skin for firming effects.
—Jenny Berg, Vogue, 23 June 2026
The development turned to a phenomenon called Triplet-Triplet Annihilation (TTA) in which two excited molecules collide and pool their energy to emit a single, ultra-high-energy photon.
—Mrigakshi Dixit, Interesting Engineering, 23 June 2026
Growing evidence also suggests that in order to perform these functions, bones produce signaling molecules that influence energy metabolism and balance the minerals the body needs.
—Priya Bhardwaj, The Conversation, 22 June 2026
See All Example Sentences for molecule
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Omer Awan, Forbes.com, 23 June 2026
Stepping in for the night shift, the Infil Serum sends hyaluronic acid molecules deep into the skin for firming effects.
—Jenny Berg, Vogue, 23 June 2026
The development turned to a phenomenon called Triplet-Triplet Annihilation (TTA) in which two excited molecules collide and pool their energy to emit a single, ultra-high-energy photon.
—Mrigakshi Dixit, Interesting Engineering, 23 June 2026
Growing evidence also suggests that in order to perform these functions, bones produce signaling molecules that influence energy metabolism and balance the minerals the body needs.
—Priya Bhardwaj, The Conversation, 22 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 24 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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