A wire that provides an electrical connection to the ground.
The purpose of an earth wire may be to protect against accidental electric shock (by providing a route for current that would otherwise pass through a person), or against possible damage (by limiting the increase in voltage that can occur in a device). In some situations, such as telegraphy, an earth wire functions as one of the conductors..
Origin
Mid 19th century; earliest use found in The Mechanics' Magazine. From earth + wire.
earth-wire2
/ˈəːθwʌɪə/
Electricityrare
verb
[with object]To provide with or connect to an earth wire.
Origin
Late 19th century; earliest use found in William Preece (1834–1913), electrical engineer and administrator. From earth wire.