/,ekstrə'mjʊərəl; ,ɛkstrə`mjurəl/
adj [usu attrib 通常作定语]
1 (of university teaching, courses, etc) for people who are not full-time residential members of a university （指大学教学、课程等）为校外学生的
*extramural studies, lectures, courses, students 大学校外课程的学习、大学校外课程的授课、大学的校外课程、大学校外课程部的学生
* the extramural department of a university 大学的校外课程部.
2 (of work, etc) not done as part of one's official (paid) duties （指工作等）业余的
*on an extramural basis 在业余的基础上.

adj [only before noun]
[Date: 1800-1900; Language: Latin;Origin: extra muros 'outside the walls']
relating to a place or organization but happening or done outside it
　extramural activities
especially BrE extramural courses are for people who are not full-time students