Webster's English Dictionary

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extern

1. ex.tern \ek-'st*rn\ aj [MF or L; MF externe, fr. L externus] archaic  : 
   EXTERNAL, OUTER 
2. ex.tern also ex.terne \'ek-.st*rn\ n : a person connected with an 
   institution but not living or boarding in it;  specif : a nonresident 
   doctor or medical student at a hospital