The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

   Soft chancre. A chancroid. See Chancroid.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chancroid \Chan"croid\, n. [Chancre + -oil.] (Med.)
   A venereal sore, resembling a chancre in its seat and some
   external characters, but differing from it in being the
   starting point of a purely local process and never of a
   systemic disease; -- called also soft chancre.
   [1913 Webster]