extramural
adjective mainly UK uk/ˌek.strəˈmjʊə.rəl/ us/ˌek.strəˈmjʊr.əl/ (US usually extension)
（尤指学院或大学）对校外学生提供课程的;为非在校生而设的
organized by a college or university, etc. for people who are not students there
extramural classes/courses 对校外学生开设的课程
Opposite: intramural