# myasthenia

> English word · Noun · frequency rank #81,611

## Definitions
1. Abnormal weakness of the muscles; but especially myasthenia gravis.

## Etymology
From my- (“relating to muscle”) + asthenia (“weakness”), from Ancient Greek ἀσθένεια (asthéneia, “weakness”). By surface analysis, my- (“muscle”) + a- (“not”) + sthen- (“strength”) + -ia (“disease”).

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