cubiculum in English dictionary cubiculum Meanings and definitions of "cubiculum" A small room, especially a bedroom, typically those small rooms found on the upper floor of a Roman house. A small room carved out of the wall of a catacomb, used as mortuary chapels, and in Roman times, for Christian worship. noun A small room, especially a bedroom, typically those small rooms found on the upper floor of a Roman house. noun A small room carved out of the wall of a catacomb, used as mortuary chapels, and in Roman times, for Christian worship. more Grammar and declension of cubiculum cubiculum ( plural cubiculums or cubicula) cubiculum (plural cubiculums or cubicula) more Sample sentences with "cubiculum" Declension Stem Try again Available translations Bulgarian Italian Persian Portuguese Authors