The Collaborative International Dictionary of English v.0.48:

Zonar \Zo"nar\, n. [Mod. Gr. ? a girdle, fr. Gr. ?, dim. of ? a
   girdle. See Zone.]
   A belt or girdle which the Christians and Jews of the Levant
   were obliged to wear to distinguish them from Mohammedans.
   [Written also zonnar.]
   [1913 Webster]