The Collaborative International Dictionary of English v.0.48:

Shrouded \Shroud"ed\, a.
   Provided with a shroud or shrouds.
   [1913 Webster]

   Shrouded gear (Mach.), a cogwheel or pinion having flanges
      which form closed ends to the spaces between the teeth and
      thus strengthen the teeth by tying them together.
      [1913 Webster]