Wiktionary
half bath
n. (context North America English) A bathroom or lavatory in a home containing a sink and a toilet, but no bathtub or shower.
Usage examples of "half bath".
Some former owner had built another bedroom and a half bath in the basement, and Bill had chosen those rooms for his own.
While Pat Five had already preempted the half bath and showed no sign of coming out of it, either.
Patrice inclined her head toward the half bath where Pat Five remained closeted.