Electrophori

Part of speech: noun

Definitions

1. Plural form of a device that generates static electricity by transferring electric charge to a conductor through induction, used in early experiments to demonstrate electrostatic phenomena
2. Multiple instruments designed to produce and transfer static electric charge by induction from an excited source to a metal plate for scientific demonstration or measurement
3. Several apparatuses that obtain and accumulate static electricity via induction, typically consisting of a charged base and a movable conductor, historically significant in the study of electricity

Etymology: "Electrophori" is the plural of "electrophorus," the name of an 18th-century device. The singular is built from Greek roots: "elektron" (amber, the substance whose rubbing first drew attention to static charge) and "phoros" (bearing or carrying), so the name means roughly "electricity-bearer." The plural form follows the Latin-style second-declension ending, the same pattern that gives "stimuli" or "fungi" for singular nouns in "-us." The device itself was a flat insulating disc, typically resin, with a metal plate placed on top. Charging the disc by rubbing and then touching the plate briefly with a finger let a separate, isolated plate accumulate a strong charge that could be drawn off as sparks. Physicists used these instruments to show that charge could be produced without direct contact with a source, which is what "induction" describes. Several versions were built in the 1700s, and the name stuck to the family of devices rather than to one inventor's model.

Synonyms: electrophore