I knew because I had a friend whose mother had one in her bedroom....however, I still don’t know how to pronounce it.
“.....however, I still dont know how to pronounce it.”
Several of my french relatives had/have prie-dieus in their homes, usually at the foot of their bed. One had a little chapel in her home and had a prie-dieu there. It means pray(prie) to God(Dieu in French)
Here is how it is pronounced
http://www.howjsay.com/index.php?word=prie-dieu