pelmet

noun

1. 窗帘盒；窗帘短帷幔
   a strip of wood or cloth above a window that hides the curtain rail

1. （遮盖窗帘杆的）窗帘盒，窗帘帷幔，帘头
   A pelmet is a long, narrow piece of wood or fabric which is fitted at the top of a window for decoration and to hide the curtain rail.

in AM, use 美国英语用 valance

noun

1. a decorative framework to conceal curtain fixtures at the top of a window casing

   Synonym:    cornicevalancevalance board