alma mater
Concise Oxford English Dictionary © 2008 Oxford University Press:
alma mater /ˌalmə ˈmɑːtə, ˈmeɪt-/
▶noun one's former university, school, or college.
– origin C17 (in the sense ‘a source of nourishment’): L., lit. ‘generous mother’.
'alma mater' also found in these Oxford entries:

