maisonette
Concise Oxford English Dictionary © 2008 Oxford University Press:
maisonette /ˌmeɪzəˈnɛt/
▶noun a set of rooms for living in, typically on two storeys of a larger building and having a separate entrance.
– origin C18: from Fr. maisonnette, dimin. of maison ‘house’.
'maisonette' also found in these Oxford entries:

