Longman Dictionary of Contemporary English
Wiktionary
n. A room in a house, in which the head of the house sleeps.
WordNet
n. the principal bedroom in a house; usually occupied by the head of the household
Usage examples of "master bedroom".
The two of them were in the enormous master bedroom with its odd L-shape, looking out to the hallway through the door.
The body of the once-pretty young Italian terrorist-if, indeed, her stated nationality was not as much a lie as her stated name-lay just inside the doorway of the master bedroom.
The rest of the house was a half-bath next to the kitchen, two good-sized bedrooms at the front of the house, separated by a nice large bathroom, and the master bedroom and bathroom suite at the back.
The master bedroom was beyond even that, but the bed was carefully made, untouched.
I turned down a short hall at the top of the stairs, and followed Murphy into what was apparently a master bedroom, where I found the source of all the scents.
His dressing room was off his study which was next door to their master bedroom.
In what, by its size and luxury, must have been the master bedroom, the polar bearskin rug thrown over the bed was warm and rumpled as if someone had just been lying there and now hid, perhaps, in the ivorine wardrobe, enjoying my perplexity.
They stopped at the door of the master bedroom, a small suite within the suite, and Abban opened the door on manual.