"antechamber of" is correct and usable in written English.
You can use it to refer to a room or area that is adjacent to, or precedes a larger and more important room. For example, "We stepped into the antechamber of the throne room."
Fascist party badges disappeared overnight, and the antechamber of Mussolini's office, usually full, stood empty.
Fascist party badges disappeared overnight; the antechamber of Mussolini's office, usually full, stood empty.
Since then, the Arsenal players had spent their time in an antechamber of uncertainty.
The separated rat family now reunited not in the kidnapping site but in the antechamber of an eight-room condo.
London has long been the antechamber of Pakistani politics, where self-exiled leaders take refuge until they can return.
Crammed body to body, they wait in the antechamber of the auditorium feeling numerous as the stars.
So, too, did the set, which had the corrugated steel and antechambers of a spaceship.
Emergency decontamination equipment is on standby in the antechambers of each tent in case of accidents.
A survey in the Journal of Medical Ethics found religious doctors far less likely to keep the dying deeply sedated if that risked hastening death, forcing people to linger in the agonising antechambers of death.
In those days, before Nick pivoted toward reaching a national audience, our quarry was primarily the Manhattan-based semi-demimonde, the barely socialites, the sweaty strivers in the antechambers of Graydon Carter's seven rooms of New York City.
"They are simple people who do not come from the antechambers of foreign embassies," says Michaloliakos, who was vaulted into the national consciousness when he won a seat on Athens city council in 2010 and addressed its first session with a Nazi salute.
