Source : Webster's Revised Unabridged Dictionary (1913)

Cystitis \Cys*ti"tis\ (s?s-t?"t?s), n. [Cyst + -itis: cf. F.
   cystite.] (Med.)
   Inflammation of the bladder.

Source : WordNet®

cystitis
     n : inflammation of the urinary bladder and ureters