chamber vs operating theatre

chamber

noun
  • Any enclosed space occupying or similar to a room. 

  • One of the bullet-holding compartments in the cylinder of a revolver. 

  • The legislature or division of the legislature itself. 

  • The room used for deliberation by a legislature. 

  • A short piece of ordnance or cannon which stood on its breech without any carriage, formerly used chiefly for celebrations and theatrical cannonades. 

  • The private office of a judge. 

  • One of the two atria or two ventricles of the heart. 

  • The private room of an individual, especially of someone wealthy or noble. 

  • A single law office in a building housing several. 

  • The area holding the ammunition round at the initiation of its discharge. 

  • A bedroom. 

  • An enlarged space in an underground tunnel of a burrowing animal. 

verb
  • To place in a chamber, as a round of ammunition. 

  • To reside in or occupy a chamber or chambers. 

  • To create or modify a gun to be a specific caliber. 

  • To enclose in a room. 

  • To prepare an offensive, defensive, or counteroffensive action by drawing a limb or weapon to a position where it may be charged with kinetic energy. 

operating theatre

noun
  • A room in a hospital used for performing surgery (originally designed for operations in front of observers). 

How often have the words chamber and operating theatre occurred in a corpus of books? (source: Google Ngram Viewer )