Source : Webster's Revised Unabridged Dictionary (1913)

Myocarditis \My`o*car*di"tis\, n. [NL. see {Myocardium}.] (Med.)
   Inflammation of the myocardium.

Source : WordNet®

myocarditis
     n : inflammation of the myocardium (the muscular tissue of the
         heart) [syn: {myocardial inflammation}]