Source : Webster's Revised Unabridged Dictionary (1913)

Syphilitic \Syph`i*lit"ic\, a. [Cf. F. syphilitique.] (Med.)
   Of or pertaining to syphilis; of the nature of syphilis;
   affected with syphilis. -- n. A syphilitic patient.

Source : WordNet®

syphilitic
     adj : of or relating to or infected with syphilis; "syphilitic
           symptoms"
     n : a person suffering from syphilis