I. ek-ˈstərn, ˈek-ˌ adjective
Etymology: Middle French or Latin; Middle French externe, from Latin externus
Date: 1530
archaic : external
II. noun
also ex·terne ˈek-ˌstərn
Date: 1823
: a person connected with an institution but not living or boarding in it ; specifically : a nonresident doctor or medical student at a hospital