Source : Webster's Revised Unabridged Dictionary (1913)

Chloasma \Chlo*as"ma\, n. [Gr. ? to be green.] (Med.)
   A cutaneous affection characterized by yellow or yellowish
   brown pigmented spots.

Source : WordNet®

chloasma
     n : a tan discoloration of a woman's face that is associated
         with pregnancy or with the use of oral contraceptives
         [syn: {melasma}, {mask of pregnancy}]