Cloistress is a term that is rarely heard nowadays, but it is a word used to describe a woman who lives in a convent or monastery. Synonyms for cloistress include nun, sister, religious, conventual, monastic, and anchorite. These words all describe a woman who has chosen a life of seclusion, devotion, and prayer, and whose life revolves around her religious beliefs. While the use of the word cloistress may be limited today, the concept of women living a cloistered life of devotion and prayer is still found in many religious traditions around the world.