Source : Webster's Revised Unabridged Dictionary (1913)

Keratitis \Ker`a*ti"tis\, n. [NL., fr. Gr. ke`ras, -atos, horn +
   -itis.] (Med.)
   Inflammation of the cornea.

Source : WordNet®

keratitis
     n : inflammation of the cornea causing watery painful eyes and
         blurred vision