The Collaborative International Dictionary of English v.0.48:

Electrophorus \E*lec`troph"o*rus\, n.; pl. Electrophori. [NL.,
   fr. combining form electro- + Gr. fe`rein to bear.] (Physics)
   An instrument for exciting electricity, and repeating the
   charge indefinitely by induction, consisting of a flat cake
   of resin, shellac, or ebonite, upon which is placed a plate
   of metal.
   [1913 Webster]