'Myocardium' definitions:
Definition of 'myocardium'
From: WordNet
noun
The middle muscular layer of the heart wall
Definition of 'Myocardium'
From: GCIDE
- Myocardium \My`o*car"di*um\, n. [NL., fr. Gr. ?, ?, muscle + ? heart.] (Anat.) The main substance of the muscular wall of the heart inclosed between the epicardium and endocardium. [1913 Webster]