Etymology
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extern (n.)

"outsider," c. 1600, from French externe "outer, outward;" as a noun, "a day-scholar," from Latin externus "outside," also used as a noun (see external). As an adjective in English from 1530s.

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Definitions of extern

extern (n.)
a nonresident doctor or medical student; connected with a hospital but not living there;
Synonyms: medical extern
From wordnet.princeton.edu