# 5-hydroxytryptamine

> English word · Noun

## Definitions
1. The neurotransmitter serotonin.

## Etymology
It is a tryptamine with a hydroxyl group attached to the carbon atom that is numbered as 5.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/5-hydroxytryptamine