neurotransmitter
noun
neu·ro·trans·mit·ter
ˌnu̇r-ō-tran(t)s-ˈmi-tər 
-tranz-,
ˌnyu̇r-
: a substance (such as norepinephrine or acetylcholine) that transmits nerve impulses across a synapse
Examples of neurotransmitter in a Sentence
Recent Examples on the Web
Because serotonin is the neurotransmitter that fuels feelings of happiness, having less of it can contribute to low mood.
—
Marisa McMillan, Outside, 20 Dec. 2025
That’s because your brain depends on amino acids to make neurotransmitters like dopamine and serotonin, the chemical messengers that regulate mood, motivation, and alertness.
—Lauryn Higgins, Time, 18 Dec. 2025
Addyi works on neurotransmitters in the brain, including dopamine and serotonin, rather than directly on hormones.
—Emily Cegielski, Flow Space, 16 Dec. 2025
The gut microbiome helps our bodies digest important nutrients, train our immune system, and can even stimulate the production of important neurotransmitters in our brains.
—Laura Baisas, Popular Science, 3 Dec. 2025
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Marisa McMillan, Outside, 20 Dec. 2025
That’s because your brain depends on amino acids to make neurotransmitters like dopamine and serotonin, the chemical messengers that regulate mood, motivation, and alertness.
—Lauryn Higgins, Time, 18 Dec. 2025
Addyi works on neurotransmitters in the brain, including dopamine and serotonin, rather than directly on hormones.
—Emily Cegielski, Flow Space, 16 Dec. 2025
The gut microbiome helps our bodies digest important nutrients, train our immune system, and can even stimulate the production of important neurotransmitters in our brains.
—Laura Baisas, Popular Science, 3 Dec. 2025
See All Example Sentences for neurotransmitter
Cite this Entry
“Neurotransmitter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/neurotransmitter. Accessed 6 Jan. 2026.
Copy CitationKids Definition
neurotransmitter
noun
neu·ro·trans·mit·ter
ˌn(y)u̇r-ō-tran(t)s-ˈmit-ər
-tranz-
: a substance (as acetylcholine) that carries a nerve impulse from one neuron to another across a synapse
Medical Definition
neurotransmitter
noun
neu·ro·trans·mit·ter
ˌn(y)u̇r-ō-tran(t)s-ˈmit-ər, -tranz-
: a substance (as norepinephrine or acetylcholine) that transmits nerve impulses across a synapse see false neurotransmitter
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