1. [n]  a timber member grooved to take a sliding panel
2. [n]  a flat situated in the wings

COULISSE is a 8 letter word that starts with C.

1. \Cou*lisse"\ (k??-l?s"; F. k??`l?s"), n. [F., fr.
   couler to flow, glide.]
   1. A piece of timber having a groove in which something
      glides.
   
   2. One of the side scenes of the stage in a theater, or the
      space included between the side scenes.
   
   

2. \Cou*lisse"\, n.
   1. A fluting in a sword blade.
   
   2. The outside stock exchange, or ``curb market,'' of Paris.
      [French Use]