# MERRF syndrome

> English word · Noun

## Definitions
1. A rare mitochondrial disease characterized by progressive myoclonic epilepsy and clumps of diseased mitochondria that accumulate in the subsarcolemmal region of the muscle fiber and appear as "ragged red fibers" when stained.

## Etymology
Short for "myoclonic epilepsy with ragged red fibers".

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