# endorphin

> English word · Noun · IPA /ɛnˈdɔːfɪn/ · frequency rank #70,637

## Definitions
1. Any of a group of peptide hormones found in the mammalian brain that act as neurotransmitters and have properties similar to morphine.

## Etymology
Borrowed from French endorphine, from endo(gène) (“endogenous, produced within”) and morphine.

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