extramural

• extra-mural

From Latin extramuralis, from extra (“outside”) + muralis (“of a wall”).

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• Rhymes: -ʊəɹəl

extramural (not comparable)

1. Taking place outside the walls of an institution, especially a school or university or prison.
   • 1961 February, “Talking of Trains: New L.T. research laboratory”, in Trains Illustrated, page 76:

     [...] a notable acquisition at Chiswick is a machine, believed to be unique of its type, which has been designed and constructed under an extramural research contract at the University of Nottingham for studying fatigue in railway axles.

2. Describing teaching of students who are not resident at such an institution.

• (antonym(s) of “outside the walls”): intramural

• “extramural”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.