Serotonin
noun /ˌsɛr.əˈtoʊ.nɪn/ — A neurotransmitter associated with wellbeing and mood stability
Definition
A neurotransmitter found primarily in the gut, blood, and brain, strongly associated with feelings of wellbeing, happiness, and mood stability. Serotonin regulates sleep, appetite, and digestion, as well as emotional balance.
Beyond the definition
Serotonin is the chemistry of enough — the neurotransmitter of contentment rather than peak pleasure. Where dopamine is the thrill, serotonin is the calm confidence of having what you need.
Origin & history
Latin: serum (watery fluid) + Greek: tonos (tone). Discovered in the 1940s. The name reflects its blood-vessel-constricting properties. Its role in mood was understood gradually through the development of antidepressants.
Example sentences
Illustrative sentences for learning, not verified community posts or sourced quotations.
Exercise, sunlight, and social connection all support natural serotonin production.
Low serotonin is associated with depression — not as a cause but as a correlate.
Serotonin is the neurotransmitter of 'okay' — not ecstatic, just fundamentally alright.
How to use it
This entry uses a noun. Follow the examples for articles and singular or plural forms; not every noun takes “a” or “an.”
Choose “Serotonin” when the meaning fits your context: A neurotransmitter found primarily in the gut, blood, and brain, strongly associated with feelings of wellbeing, happiness, and mood stability. Serotonin regulates sleep, appetite, and digestion, as well as emotional balance.
Synonyms
feel-good neurotransmitter, mood stabiliser
Related words
Serotonin vs dopamine
Serotonin regulates mood, sleep, and overall wellbeing. Dopamine is specifically linked to reward, anticipation, and the drive to achieve goals.
Word in the Wild
See how this word appears in life, language and stories.
Illustrative sentences and imagined stories for learning — not verified sightings, interviews, or sourced quotations.
Fictional scene
Peaceful Contentment and Presence
An adult sits at a table after a meal, looking lost in thought at a candle.
The relaxed, unhurried posture reflects mood stability and wellbeing associated with serotonin. The candlelight and simple presence demonstrate a regulated emotional balance, where one is not driven by external chaos but remains centered and calm.
Image credit: Wordspun · AI-generated conceptual illustration
Questions about this word
What does "Serotonin" mean?
Serotonin is noun meaning: A neurotransmitter associated with wellbeing and mood stability. A neurotransmitter found primarily in the gut, blood, and brain, strongly associated with feelings of wellbeing, happiness, and mood stability. Serotonin regulates sleep, appetite, and digestion, as well as emotional balance.
Where does the word "Serotonin" come from?
Latin: serum (watery fluid) + Greek: tonos (tone). Discovered in the 1940s. The name reflects its blood-vessel-constricting properties. Its role in mood was understood gradually through the development of antidepressants.