The Collaborative International Dictionary of English v.0.48:

Bedchamber \Bed"cham`ber\, n.
   A chamber for a bed; an apartment form sleeping in. --Shak.
   [1913 Webster]

   Lords of the bedchamber, eight officers of the royal
      household, all of noble families, who wait in turn a week
      each. [Eng.]

   Ladies of the bedchamber, eight ladies, all titled, holding
      a similar official position in the royal household, during
      the reign of a queen. [Eng.]
      [1913 Webster]