Source : Webster's Revised Unabridged Dictionary (1913)

Chancre \Chan"cre\, n. [F. chancere. See {Cancer}.] (Med.)
   A venereal sore or ulcer; specifically, the initial lesion of
   true syphilis, whether forming a distinct ulcer or not; --
   called also {hard chancre}, {indurated chancre}, and
   {Hunterian chancre}.

   {Soft chancre}. A chancroid. See {Chancroid}.

Source : WordNet®

chancre
     n : a small hard painless nodule at the site of entry of a
         pathogen (as syphilis)