partition wall
/pɑːˌtɪʃn ˈwɔːl/ /pəˌtɪʃn ˈwɔːl/noun
A wall forming a partition; especially a light internal wall separating one room or portion of a building from another.
- In early use figurative with allusion to Ephesians 2:14..
Origin
Early 17th century. From partition + wall.