Serotonin

//ˌsɛɹəˈtəʊnɪn// noun

noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    An indoleamine neurotransmitter, 5-hydroxytryptamine, that is involved in depression, appetite, etc., and is crucial in maintaining a sense of well-being, security, etc. countable, uncountable

    "Notably, mouse lines targeting genes codifying for serotonin receptors, for enzymes involved in 5-HT synthesis as Tph1 and Tph2, in its metabolism as monoaminoxidase A (MAOA) or in its re-uptake as serotonin transporter (SERT), have been generated."

  2. 2
    a neurotransmitter involved in e.g. sleep and depression and memory wordnet

Example

More examples

"This medication influences the amount of serotonin in the brain."

Etymology

From sero- + tone + -in.

Related phrases

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.