The Collaborative International Dictionary of English v.0.48:
Exchanger \Ex*chan"ger\, n. One who exchanges; one who practices exchange. --Matt. xxv. 27. [1913 Webster]WordNet (r) 3.0 (2006):
exchanger n 1: one whose business is to exchange the money of one country for that of another country [syn: exchanger, money changer]