A "dorm" is a short way of saying dormitory, which is a shared living space for students. It's usually a building with individual rooms where students sleep and study. Full definition
We provide you good bed in dorm room and warm service. (hostelbookers.com)
We kept hearing reports about this guest house (with dorm beds), which contains a fully - stocked back porch saloon with a stage for live music. (matadornetwork.com)
So instead I did it at home — and my apartment is really just a small room with a bed, so this workout is perfect for dorm rooms as well! (annesmiles.com)