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From The Collaborative International Dictionary of English v.0.48:
Oersted \Oer"sted\, n. [After Hans Christian Oersted, Danish physicist.] (Elec.) The C. G. S. unit of magnetic reluctance or resistance, equal to the reluctance of a centimeter cube of air (or vacuum) between parallel faces. Also, a reluctance in which unit magnetomotive force sets up unit flux. [Webster 1913 Suppl.] oesophagus