noun ·5 syllables ·Rare ·Advanced level

Definitions

Noun

1. 1
   The muscular substance of the heart; the middle of the three layers forming the outer wall of the human heart.
2. 2
   the middle muscular layer of the heart wall wordnet

Synonyms

All synonyms

cardiac muscleheart muscle

Etymology

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

Related phrases

myocardial infarction

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.