an apparatus consisting of an insulated resin disk and a metal plate, used in generating static electricity by induction
See electrophorus in American Heritage Dictionary 4
(ĭ-lĕkˌtrŏfˈər-əs, ēˌlĕk-)
nounpl.e·lec·troph·o·ri(-ə-rīˌ, -ə-rēˌ)
An apparatus for generating static electricity, consisting of a hard rubber disk that is given a negative charge by friction and a metal plate that is given a net positive charge by induction when in contact with the disk.