Rhodes scholar, e.g

• Resident of the oldest English university city
• Clinton, once
• Student at England's oldest university
• Relating to a top British university
• Tony Blair, for one
• English university student
• Relating to Oxford

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"pertaining to Oxford or to Oxford University," 1640s, from Medieval Latin oxonia , Latinized form of Middle English Oxforde (see Oxford ). Earlier as a noun (1540s).

Wiktionary Word definitions in Wiktionary
a. (context mineralogy English) Describing minerals containing oxygen

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Oxonian \Ox*o"ni*an\, prop. a. Of or relating to the city or the university of Oxford, England. --Macaulay.