The Collaborative International Dictionary of English v.0.48:

Cloisonn'e \Cloi`son*n['e]\, a. [F., partitioned, fr. cloison a
   partition.]
   Inlaid between partitions: -- said of enamel when the lines
   which divide the different patches of fields are composed of
   a kind of metal wire secured to the ground; as distinguished
   from champlev['e] enamel, in which the ground is engraved
   or scooped out to receive the enamel. --S. Wells Williams.
   [1913 Webster]