What is the Latin term for 'bedroom'?

The Latin term for 'bedroom' is indeed cubiculum. In ancient Roman architecture, a cubiculum was designated as a small room, typically used for sleeping and resting, making it specifically analogous to a modern bedroom. It served as a private space where an individual could sleep and store personal belongings.

In considering the other terms, 'cubus' refers to a cube or a block, lacking the specific reference to a sleeping area. 'Lectus' translates to a bed or couch and pertains more to the furniture you would find in a cubiculum rather than the room itself. 'Cella' denotes a chamber or cell, often used in temple architecture or for storage, but it does not have the specific implication of a bedroom. Thus, cubiculum is the appropriate term to signify a bedroom in Latin, capturing the essence of a private sleeping area.