1911 Encyclopædia Britannica/Cubicle

CUBICLE (Lat. cubiculum), a small chamber containing a couch or a bed. The small rooms opening into the atrium of a Pompeian house are known as cubicula. In modern English schools “cubicle” is the term given to the separate small bedrooms into which the dormitories are divided, as opposed to the system of large open dormitories.