reotrope

from The Collaborative International Dictionary of English v.0.48

Reotrope \Re"o*trope\ (-tr?p), n. (Physics)
   See {Rheotrope}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Rheotrope \Rhe"o*trope\, n. [Gr. "rei^n to flow + ??? to turn.]
   (Elec.)
   An instrument for reversing the direction of an electric
   current. [Written also {reotrope}.]
   [1913 Webster]