Me*las"mic

from The Collaborative International Dictionary of English v.0.48

Melasma \Me*las"ma\, n. [NL., fr. Gr. ? black spot.] (Med.)
   A dark discoloration of the skin, usually local; as,
   Addison's melasma, or Addison's disease. -- {Me*las"mic}, a.
   [1913 Webster]