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 variety of organic molecules observed suggests that some chemical diversity has been preserved in ancient Martian sediments despite billions of years of diagenesis (the process by which sediment turns to rock) and radiation exposure. —
Leonard David, Space.com, 21 Apr. 2026 But because of random chance, there will always be some slow-moving molecules in the hot object and some fast-moving molecules in the cold object. —Stephanie Pappas, Scientific American, 21 Apr. 2026 The experiment, conducted in 2020, detected more than 20 organic molecules, including several that had never before been confirmed on Mars. —CBS News, 21 Apr. 2026 In places scientists weren’t looking, and in parts of the genome dismissed as structural, there were functional molecules with potential to treat disease. —Asaf Elia-Shalev, Sun Sentinel, 21 Apr. 2026 See All Example Sentences for molecule
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Leonard David, Space.com, 21 Apr. 2026 But because of random chance, there will always be some slow-moving molecules in the hot object and some fast-moving molecules in the cold object. —Stephanie Pappas, Scientific American, 21 Apr. 2026 The experiment, conducted in 2020, detected more than 20 organic molecules, including several that had never before been confirmed on Mars. —CBS News, 21 Apr. 2026 In places scientists weren’t looking, and in parts of the genome dismissed as structural, there were functional molecules with potential to treat disease. —Asaf Elia-Shalev, Sun Sentinel, 21 Apr. 2026 See All Example Sentences for molecule
Cite this Entry
“Molecule.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.grautoblog.com/dictionary/molecule. Accessed 28 Apr. 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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