From Longman Dictionary of Contemporary Englishmaster bedroomˈmaster ˌbedroom noun [countable] DHHthe largest bedroom in a house or apartment, often with its own bathroom
Examples from the Corpus
master bedroom• It had once been the master bedroom and looked out on the woods to the east.• Liz's face must have said so, for Anna undressed in the master bedroom and climbed into bed.• The wedding was over and Edna had moved into the master bedroom.• This was the master bedroom, with the master bath.• The master bedroom is equally charming with delicate lace draped across the archway to give an almost Eastern feel. 