Source : Webster's Revised Unabridged Dictionary (1913)

Carditis \Car*di"tis\, n. [NL., fr. Gr. kardi`a heart + -itis:
   cf. F. cardite.] (Med)
   Inflammation of the fleshy or muscular substance of the
   heart. See {Endocarditis} and {Pericarditis}. --Dunglison.

Source : WordNet®

carditis
     n : inflammation of the heart