[ek-sturn; for 3 also ik-sturn]
a person connected with an institution but not residing in it, as a doctor or medical student at a hospital.
a nun of a strictly enclosed order, as the Carmelites, who resides inside the convent but outside its enclosure and who chiefly goes on outside errands.
Archaic. external; outer.

1525–35; < Latin externus, derivative of exter, exterus. See exterior

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World English Dictionary
extern or externe (ˈɛkstɜːn, ɪkˈstɜːn, ˈɛkstɜːn, ɪkˈstɜːn)
(US) a person, such as a physician at a hospital, who has an official connection with an institution but does not reside in it
[C16: from Latin externusexternal]
externe or externe
[C16: from Latin externusexternal]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

extern ex·tern (ěk'stûrn')
An advanced student or recent graduate who assists in the medical or surgical care of hospital patients and may reside outside the institution.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The extern will keep a daily record of tasks completed.
And an extern license cannot be issued if the applicant is deficient in one of the core courses.
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