# myocardium

> English word · Noun · frequency rank #77,020

## Definitions
1. The muscular substance of the heart; the middle of the three layers forming the outer wall of the human heart.

## Etymology
From New Latin myocardium, from Ancient Greek μῦς (mûs, “muscle”) + καρδίᾱ (kardíā, “heart”).

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