# myelin

> English word · Noun · IPA /ˈmaɪəlɪn/ · frequency rank #52,512

## Definitions
1. A white, fatty material, composed of lipids and lipoproteins, that surrounds the axons of nerves.

## Etymology
Etymology tree
Ancient Greek μυελός (muelós)der.
English myelo-
English -ineclip.
English -in
English myelin
From myelo- + -in.
From Ancient Greek μυελός (muelós, “marrow”).

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