throne room

noun3

1. •
   A room with a throne.

   • “Wild-eyed and disheveled, King Hrethel roamed every night through his throne room, which was empty and still.” — 1961
2. •
   A room used for formal public audiences by a monarch.
3. •
   (slang, humorous) A bathroom: a room with a toilet, especially one in one's home.