Source : Webster's Revised Unabridged Dictionary (1913)

Dermatologist \Der`ma*tol"o*gist\, n.
   One who discourses on the skin and its diseases; one versed
   in dermatology.

Source : WordNet®

dermatologist
     n : a doctor who specializes in the physiology and pathology of
         the skin [syn: {skin doctor}]