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]

WordNet (r) 3.0 (2006):

bedchamber
    n 1: a room used primarily for sleeping [syn: bedroom,
         sleeping room, sleeping accommodation, chamber,
         bedchamber]

Easton's 1897 Bible Dictionary:

Bed-chamber
   an apartment in Eastern houses, furnished with a slightly
   elevated platform at the upper end and sometimes along the
   sides, on which were laid mattresses. This was the general
   arrangement of the public sleeping-room for the males of the
   family and for guests, but there were usually besides distinct
   bed-chambers of a more private character (2 Kings 4:10; Ex. 8:3;
   2 Kings 6:12). In 2 Kings 11:2 this word denotes, as in the
   margin of the Revised Version, a store-room in which mattresses
   were kept.